The surprising day Princess Diana called the “worst in her life”

More than 20 years after Princess Diana’s passing, new information and photos continue to surface, giving a deeper look into who she was beyond her public persona. Although there are so many stunning, rarely seen photos of Princess Diana and the royal family, some of the most telling information is on tape. 

In a documentary from National Geographic titled Diana: In Her Own Words, the princess speaks extensively about her relationship with Prince Charles, including what was going through her mind on her wedding day. 

The audio of Princess Diana speaking her side of the story comes from a series of interviews conducted in 1991 for a planned biography. Although Princess Diana never claims to have considered canceling the wedding, she goes on to describe the day as “the worst day of my life.”  

RELATED: Inside the royal wedding 

21 PHOTOS
Princess Diana's Wedding
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Princess Diana's Wedding
The Prince and Princess of Wales kiss on the balcony of Buckingham Palace after their wedding. (PA Archive)
Prince Charles, Prince of Wales and Diana, Princess of Wales leave St. Pauls Cathedral in London following their wedding on July 29, 1981. (Anwar Hussein)
Lady Diana Spencer and Prince Charles leaving St. Paul's Cathedral after their wedding rehearsal. (PA Archive)
The adorable bridal attendants group on the steps of St.Paul's Cathedral before the wedding ceremony of the Prince of Wales to Lady Diana Spencer. (PA Archive)
The Prince and Princess of Wales at the High Altar in front of the Archbishop of Canterbury, Robert Runcie, during their wedding at St. Paul's Cathedral. Look at that train! (PA Archive)
The Prince and Princess of Wales pose for a wedding portrait in Buckingham Palace after their marriage ceremony at St. Paul's Cathedral. The Princess is wearing the Spencer family tiara. (PA Archive)
The Royal couple, the Prince and Princess of Wales with their young attendants. Sitting, left to right, Catherine Cameron and Clementine Hambro. Standing, left to right, Lord Nicholas Windsor, Edward Van Cutsem, Sarah Jane Gaselee (in front of India Hicks), Prince Edward, the Prince and Princess of Wales, Prince Andrew and Lady Sarah Armstrong-Jones. (PA Archive)
The Prince and Princess of Wales on the balcony of Buckingham Palace after their wedding. (PA Archive)
The Prince and Princess of Wales in an open carriage, waiting to drive to Buckingham Palace after their wedding. (PA Archive)
The relaxed Prince and Princess of Wales on their second wedding anniversary, July 29, 1983. (AP)
TODAY -- Royal Wedding -- Aired 7/29/81 -- Pictured: Lady Diana Spencer look a-like modeling a wedding dress similar to that actually worn at the Royal Wedding -- Photo by: NBCU Photo Bank
LONDON, UNITED KINGDOM - JULY 29: Diana, Princess of Wales, wearing an Emanuel wedding dress, enters St. Paul's Cathedral on the hand of her father, Earl Spencer, for her marriage to Prince Charles, Prince of Wales on 29 July, 1981 in London, England. (Photo by Anwar Hussein/Getty Images)
29th July 1981: Formal portrait of Lady Diana Spencer (1961 - 1997) in her wedding dress designed by David and Elizabeth Emanuel. (Photo by Fox Photos/Getty Images)
LONDON - JULY 29: Diana, Princess of Wales and Prince Charles ride in a carriage after their wedding at St. Paul's Cathedral July 29, 1981 in London. Diana told of a lonely existence in her married life to Prince Charles in audio tapes aired by the U.S. television network NBC on March 4, 2004. (Photo by Anwar Hussein/Getty Images)
29th July 1981: Charles, Prince of Wales, with his wife, Princess Diana (1961 - 1997), on the altar of St Paul's Cathedral during their marriage ceremony. (Photo by Hulton Archive/Getty Images)
LONDON - JULY 29: (FILE PHOTO) Prince Charles, Prince of Wales and Diana, Princess of Wales leave St. Paul's Cathedral following their wedding July 29, 1981 in London, England. (Photo by Anwar Hussein/Getty Images)
Lady Diana, Princess of Wales and Charles, Prince of Wales are seen during their wedding at St Paul Cathedral in London 29 July 1981. (Photo credit should read /AFP/Getty Images)
Newlyweds Princess Diana and Prince Charles are escorted through London to Buckingham Palace in an open horsedrawn carriage, 29th July 1981. (Photo by Jayne Fincher/Getty Images)
The Royal couple, the Prince and Princess of Wales with their young attendants. Sitting, left to right, Catherine Cameron and Clementine Hambro. Standing, left to right, Lord Nicholas Windsor, Edward Van Cutsem, Sarah Jane Gaselee (in front of India Hicks), Prince Edward, the Prince and Princess of Wales, Prince Andrew and Lady Sarah Armstrong-Jones. (Photo by PA Images via Getty Images)
Wedding day of Prince Charles & Lady Diana Spencer, 29th July 1981, Pictured: Bridal attendants at St Pauls Cathedral, RIGHT Lady Sarah Armstrong-Jones (age 17). (Photo by Mirrorpix/Getty Images)
LONDON,UNITED KINGDOM - JULY 29: Diana, Princess of Wales and Prince Charles attend their wedding on July 29, 1981 in London. (Photo by David Levenson/Getty Images) (Photo by David Levenson/Getty Images)
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One of the producers of the documentary, Tom Jennings, told TODAY that the aim was to create a film, “from Diana’s point of view,” that told, “her truth at the time.” Her misgivings about her relationship with Prince Charles date back to before the wedding when she was newly engaged. (This is the real reason Prince Charles didn’t marry Camilla Parker Bowles instead.) 

“I went upstairs, had lunch with my sisters who were there, and I said, ‘I can’t marry him. I can’t do this. This is absolutely unbelievable,'” Princess Diana says in the documentary. “And they were wonderful and said, ‘Well, bad luck, Duch. Your face is on the tea towel, so you’re too late to chicken out.’”

It turns out that Prince Charles wasn’t too keen on marrying either, according to Robert Jobson, royal correspondent and author of Charles At Seventy: Thoughts, Hopes And Dreams“I desperately wanted to get out of the wedding in 1981, when during the engagement I discovered just how awful the prospects were having had no chance whatsoever to get to know Diana beforehand,” Prince Charles told Jobson, who spent 18 months with the prince collecting information for the biography. Find out what Queen Elizabeth II would prefer we didn’t know about Prince Charles.

RELATED: Inside Princess Diana's funeral

40 PHOTOS
Princess Diana's funeral
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Princess Diana's funeral
Prince William (left) and Prince Harry, the sons of Diana, Princess of Wales, bow their heads as their mother's coffin is taken out of Westminster Abbey following her funeral service. The princess was killed in a car crash in Paris. (Photo by Adam Butler - PA Images/PA Images via Getty Images)
The Prince of Wales, Prince William and Prince Harry wait outside Westminster Abbey for Diana, the Princess of Wales' coffin to enter the Abbey. (Photo by Adam Butler - PA Images/PA Images via Getty Images)
(From left) Prince Philip, Prince William, Earl Spencer, Diana's brother, Prince Harry, and Prince Charles walk together behind the carriage carrying the casket of Princess Diana in London on its way to the funeral at Westminster Abbey, 06 September. / AFP PHOTO / POOL / STF (Photo credit should read STF/AFP/Getty Images)
Sir Elton John signing 'Candle In The Wind' at the funeral of Diana, Princess of Wales on September 6, 1997. (Photo by Anwar Hussein/WireImage)
LONDON, ENGLAND - SEPTEMBER 6: Charles, Prince of Wales, Prince William, and Prince Harry, join the Funeral Procession, at Diana Princess of Wales's Funeral, at St James Palace, for the journey to Westminster Abbey, London, on September 6, 1997, in London, England. (Photo by Julian Parker/UK Press via Getty Images)
LONDON, ENGLAND - SEPTEMBER 6: ( l to r ), The Duke of Edinburgh, Prince William, Earl Spencer, Prince Harry, and Charles, Prince of Wales join the Funeral Procession, at Diana Princess of Wales's Funeral, at St James Palace, for the journey to Westminster Abbey, London, on September 6, 1997, in London, England. (Photo by Julian Parker/UK Press via Getty Images)
Hollywood star Tom Cruise (left) and his wife, actress, Nicole Kidman arrive at the funeral service for Diana, Princess of Wales with film director Steven Spielberg at Westminster Abbey. (Photo by Adam Butler - PA Images/PA Images via Getty Images)
The Duke of Edinburgh, Prince William, Earl Spencer, Prince Harry and the Prince of Wales follow the coffin of Diana, Princess of Wales in September 1997. (Photo by Anwar Hussein/WireImage)
383207 02: Prince Charles, Right, Accepts Some Flowers From A Well-Wisher After He And His Sons Prince William, And Prince Harry, Left, Arrived At Kensington Palace To View Some Of The Flowers And Mementos Left In Memory Of Their Mother Princess Diana In London, Friday, Sept. 5, 1997. The Funeral For Princess Diana, Who Was Killed In A Car Crash In Paris Aug. 31, Will Be On Saturday At Westminster Abbey. (Photo By David Brauchli/Getty Images)
The public funeral of Diana, Princess of Wales, London, UK, 6th September 1997, Queen Elizabeth II, 6th September 1997. (Photo by John Shelley Collection/Avalon/Getty Images)
The public funeral of Diana, Princess of Wales, London, UK, 6th September 1997, Prince Philip, Duke of Edinburgh, and Prince William, 6th September 1997. (Photo by John Shelley Collection/Avalon/Getty Images)
The public funeral of Diana, Princess of Wales, London, UK, 6th September 1997, Tributes to the late Princess from the public, 6th September 1997. (Photo by John Shelley Collection/Avalon/Getty Images)
The son of Diana, Prince William (R), and her brother Earl Spencer wait in front of Westminster Abbey in London to attend the funeral ceremony of the Princess of Wales 06 September. WPA POOL / AFP PHOTO / AFP WPA POOL / JOEL ROBINE (Photo credit should read JOEL ROBINE/AFP/Getty Images)
The public funeral of Diana, Princess of Wales, London, UK, 6th September 1997, Tributes to the late Princess from the public outside Kensington Palace, 6th September 1997. (Photo by John Shelley Collection/Avalon/Getty Images)
The public funeral of Diana, Princess of Wales, London, UK, 6th September 1997, Mourners on the procession route, 6th September 1997. (Photo by John Shelley Collection/Avalon/Getty Images)
The public funeral of Diana, Princess of Wales, London, UK, 6th September 1997, Tributes to the late Princess from the public, 6th September 1997. (Photo by John Shelley Collection/Avalon/Getty Images)
The public funeral of Diana, Princess of Wales, London, UK, 6th September 1997, Prince Charles, Prince of Wales, and Prince Harry, 6th September 1997. (Photo by John Shelley Collection/Avalon/Getty Images)
Millions of flowers blanket the ground in front of London's Kensington Palace, home of Diana, Princess of Wales, Sunday Sept. 7, 1997. Diana was buried Saturday as Britain bid a massive goodbye, closing a week of shock, sorrow, regret and recriminations. (Photo by David Brauchli)
The public funeral of Diana, Princess of Wales, London, UK, 6th September 1997, Prince Charles, Prince of Wales, Prince Harry, Earl Spencer and Prince William, 6th September 1997. (Photo by John Shelley Collection/Avalon/Getty Images)
The funeral of Diana, Princess of Wales at Westminster Abbey, London. 6th September 1997. (Photo by Mike Maloney/Mirrorpix/Getty Images)
The funeral of Diana, Princess of Wales at Westminster Abbey, London. Sarah Ferguson, Duchess of York and Prince Andrew, Duke of York with their two daughters Eugenie and Beatrice. 6th September 1997. (Photo by Mike Maloney/Mirrorpix/Getty Images)
The Funeral takes place of Diana, Princess of Wales. (L-R) The Duke of Edinburgh, Prince William, Earl Spencer, Prince Harry and the Prince of Wales follow the coffin of Diana, Princess of Wales, to Westminster Abbey for her funeral service. (Photo by Adam Butler - PA Images/PA Images via Getty Images)
The Princess Royal, her husband Captain Tim Laurence (2nd left), her son Peter Phillips (2nd right) and Prince Edward leave Westminster Abbey following the funeral of Diana, Princess of Wales. (Photo by Adam Butler - PA Images/PA Images via Getty Images)
Three young women weep during the funeral procession of Diana, Princess of Wales, in London 06 September.PENNY/AFP POOL (Photo by PA Images via Getty Images)
Funeral of Diana, Princess of Wales, London, 6th September 1997 Express picture by John Downing Diana's family in Westminster Abbey (Photo by PA Images via Getty Images)
3-year-old Sam Swinney reflects the nation's sombre mood today (Saturday) as people gather on the Redheugh Bridge in Newcastle to pay their respects to Diana, Princess of Wales whose funeral was taking place at Westminster Abbey in London this morning. Photo OWEN HUMPHREYS/PA (Photo by Owen Humphreys - PA Images/PA Images via Getty Images)
The coffin of Diana, Princess of Wales is carried by the bearer party of Welsh Guardsmen as it arrives at Westminster Abbey, for her funeral today (Saturday). (Photo by PA Images via Getty Images)
Earl Spencer (4th left) Prince William, Prince Harry and The Prince of Wales (far right) watch the coffin of Diana, Princess of Wales, leave Westminster Abbey following her funeral. 23/08/02 : Britons rate the death of Diana, Princess of Wales, as the most significant event in the nation's history over the last 100 years, according to a survey published. More than 1,000 people were asked to take part in the poll, undertaken on behalf of the History Channel, with the death of Diana voted ahead of the outbreak of World War II and the winning of women's suffrage. (Photo by Sean Dempsey - PA Images/PA Images via Getty Images)
(L-R) The Prince of Wales, Prince Harry, Earl Spencer, Prince William and the Duke of Edinburgh watch the coffin of Diana, Princess of Wales, leave Westminster Abbey this afternoon (Saturday) following her funeral service. (Photo by Fiona Hanson - PA Images/PA Images via Getty Images)
LONDON, UNITED KINGDOM: Prince Charles (R), former husband of Diana, their two sons, Harry (C) and William follow the hearse in a Limousine as the coffin of Princess of Wales, makes its way from Saint James's Palace to Kensington Palace, Diana's former home, 05 September in London on the eve of her funeral. Some 2 million people are expected to line the route of the funeral procession. (Photo credit should read THOMAS COEX/AFP/Getty Images)
(Original Caption) The area around Kensington Palace, covered with flowers shows the great popularity of Diana. (Photo by Jon Jones/Sygma/Sygma via Getty Images)
Earl Charles Spencer, the younger brother of Princess Diana, stands with Prince William, Prince Harry, and Prince Charles at the funeral of Diana, Princess of Wales, only seven days after she was killed in an automobile accident in Paris. At least a million people lined the streets of central London to watch the procession with Diana's coffin from Kensington Palace to Westminster Abbey. She was buried at Althorp House, the Spencer family home in Northamptonshire. (Photo by Peter Turnley/Corbis/VCG via Getty Images)
Guardsmen of the Prince of Wales Company of the Welsh Guards put Diana's casket in a hearse after the funeral of Diana, Princess of Wales, only seven days after she was killed in an automobile accident in Paris. The coffin was draped with the Royal Standard, the monarchy's flag, and topped with three wreaths, from Diana's sons and her brother. The Princess was buried at Althorp House, the Spencer family home in Northamptonshire. (Photo by Peter Turnley/Corbis/VCG via Getty Images)
Prince Charles, Prince William, Prince Harry and Earl of Althorp wait for Diana, the Princess of Wales' funeral cortege to arrive at St James' Palace. test 2 (Photo by David Giles - PA Images/PA Images via Getty Images)
Former husband of Diana Prince Charles (L) and their two sons Harry (C) and William wait in front of the Westminster Abbey in London after the funeral ceremony of Princess of Wales 06 September. WPA POOL (Photo credit should read JOEL ROBINE/AFP/Getty Images)
BALMORAL - SEPTEMBER: Prince Charles, Prince of Wales, holds the hand of Prince Harry as they view bouquets of flowers left in memory of Diana, Princess of Wales in September 1997 in Balmoral, Scotland. (Photo by Anwar Hussein/WireImage)
LONDON- SEPTEMBER 6: (FILE PHOTO) Prince Harry stands outside Westminster Abbey at the funeral of Diana, Princess of Wales on September 6, 1997 in London, England. (Photo by Anwar Hussein/Getty Images)
LONDON - SEPTEMBER 5: (FILE PHOTO) The Prince of Wales, Prince William and Prince Harry look at floral tributes to Diana, Princess of Wales outside Kensington Palace on September 5, 1997 in London, England. (Photo by Anwar Hussein/Getty Images)
383207 02: Prince Charles, Right, Accepts Some Flowers From A Well-Wisher After He And His Sons Prince William, And Prince Harry, Left, Arrived At Kensington Palace To View Some Of The Flowers And Mementos Left In Memory Of Their Mother Princess Diana In London, Friday, Sept. 5, 1997. The Funeral For Princess Diana, Who Was Killed In A Car Crash In Paris Aug. 31, Will Be On Saturday At Westminster Abbey. (Photo By David Brauchli/Getty Images)
Prince William arriving at Aberdeen Airport to board a plane for London along with Prince Harry and his father, the Prince of Wales today (Friday). The Princes will attend the funeral of their mother, Diana, Princess of Wales at Westminster Abbey tomorrow. (Photo by PA Images via Getty Images)
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Prince Charles and Princess Diana finalized their divorce on August 28, 1996, after an extended separation and 15 years of marriage. Next, find out the 10 things Princess Diana got to keep after her divorce.

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