Sandra Bullock on wanting to be a mom at a very young age -- and why she wasn't (exclusive)

In her latest thriller, Bird Box, Sandra Bullock plays a mother of two young children -- a role that mirrors the actress' real-life role as a mom to an 8-year-old son and a 6-year-old daughter.

While she spends most of the movie's running-time trying to protect herself from an unseen evil, Bullock says the atmosphere on set was a lot lighter, as she was able to bring her kids, Louis and Laila, to the shoot, where they got a chance to hang out and play with the young stars of the film. 

The 54-year-old actress spoke with ET at the premiere of Bird Box at Alice Tully Hall at Lincoln Center in New York City on Monday, and she opened up about her kids' time with her child co-stars, Vivien Lyra Blair and Julian Edwards

"LEGOs was a big thing, [also] tag and catch," Bullock recalled. "I mean, when you get to little people, there are basically three things that they like to do, and all three of those were done on set."

Bullock added that she feels really lucky to work in an industry that gives her the chance to have her kids so close while working.

"How many people would love to be able to take their children to work and have that embraced?" Bullock asked. "It's so accepted and I feel like every set that I work on has sort of a familiar aspect to it [and] a safe feeling for family members."

39 PHOTOS
Sandra Bullock out and about
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Sandra Bullock out and about
NEW YORK, NY - DECEMBER 17: Sandra Bullock attends the 'Bird Box' New York Screening at Alice Tully Hall, Lincoln Center on December 17, 2018 in New York City. (Photo by Theo Wargo/WireImage)
BERLIN, GERMANY - NOVEMBER 27: Sandra Bullock attends the European premiere of the film 'Bird Box' at Zoo Palast on November 27, 2018 in Berlin, Germany. (Photo by Andreas Rentz/Getty Images for Netflix)
SAO PAULO, BRAZIL - DECEMBER 09: Sandra Bullock signs autographs at Comic-Con São Paulo on December 9, 2018 in Sao Paulo, Brazil. (Photo by Alexandre Schneider/Getty Images for Netflix)
NEW YORK, NY - DECEMBER 17: Sandra Bullock arrives at 'The Late Show with Stephen Colbert' at the Ed Sullivan Theater on December 17, 2018 in New York City. (Photo by Raymond Hall/GC Images)
LONDON, ENGLAND - JUNE 13: Sandra Bullock attends the 'Ocean's 8' UK Premiere held at Cineworld Leicester Square on June 13, 2018 in London, England. (Photo by Jeff Spicer/FilmMagic)
LONDON, ENGLAND - JUNE 13: Sandra Bullock attends the 'Ocean's 8' UK Premiere held at Cineworld Leicester Square on June 13, 2018 in London, England. (Photo by Jeff Spicer/FilmMagic)
LOS ANGELES - JUNE 7: The Late Late Show with James Corden airing Thursday, June 7, 2018, with guests Sandra Bullock, Sarah Paulson, and Awkwafina. (Photo by Terence Patrick/CBS via Getty Images)
TODAY -- Pictured: Hoda Kotb, Sandra Bullock, Gesine Bullock-Prado and Jenna Bush Hager on Tuesday, June 5, 2018 -- (Photo by: Nathan Congleton/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - JUNE 05: Sarah Paulson (L) and Sandra Bullock attend the 'Ocean's 8' World Premiere at Alice Tully Hall on June 5, 2018 in New York City. (Photo by Michael Stewart/WireImage)
NEW YORK, NY - JUNE 05: Sandra Bullock attends the world premiere of 'Ocean's 8' at Alice Tully Hall at Lincoln Center on June 5, 2018 in New York City. (Photo by Taylor Hill/Getty Images)
JIMMY KIMMEL LIVE: GAME NIGHT - 'Jimmy Kimmel Live: Game Night' special edition episodes air in primetime every night of the NBA Finals. The guest for Sunday, June 3 included Sandra Bullock ('Ocean's 8'). (Randy Holmes/ABC via Getty Images) SANDRA BULLOCK
TODAY -- Pictured: Hoda Kotb and Sandra Bullock on Tuesday, May 22, 2018 -- (Photo by: Nathan Congleton/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MAY 24: Sandra Bullock is seen leaving her hotel on May 24, 2018 in New York, New York. (Photo by Alessio Botticelli/GC Images)
NEW YORK, NY - MAY 22: Sandra Bullock is seen on May 22, 2018 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - MAY 22: (L-R) Sarah Paulson, Awkwafina, Sandra Bullock, Cate Blanchett, Anne Hathaway and Mindy Kalling attend the 'Ocean's 8' worldwide photo call at The Metropolitan Museum of Art on May 22, 2018 in New York City. (Photo by Daniel Zuchnik/FilmMagic)
BEVERLY HILLS, CA - MAY 03: Actress Sandra Bullock speaks during the Beverly Hills Bar Association's 2018 Entertainment Lawyer of the Year Dinner at the Montage Beverly Hills on May 3, 2018 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
LAS VEGAS, NV - APRIL 24: (L-R) Actresses Sarah Paulson, Mindy Kaling, Sandra Bullock, Cate Blanchett, Anne Hathaway and actress/rapper Awkwafina attend CinemaCon 2018 Warner Bros. Pictures Invites You to The Big Picture, an Exclusive Presentation of our Upcoming Slate at The Colosseum at Caesars Palace during CinemaCon, the official convention of the National Association of Theatre Owners on April 24, 2018 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images)
HOLLYWOOD, CA - MARCH 04: Sandra Bullock arrives at the 90th Annual Academy Awards at Hollywood & Highland Center on March 4, 2018 in Hollywood, California. (Photo by Steve Granitz/WireImage)
NEW YORK, NY - JANUARY 24: Sandra Bullock seen at the 'Ocean's Eight' film set in Central Park on January 24, 2017 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - DECEMBER 03: Sandra Bullock is seen filming 'Ocean's 8' on December 3, 2016 in New York City. (Photo by Alessio Botticelli/FilmMagic)
NEW YORK, NY - DECEMBER 03: Sandra Bullock seen on December 3, 2016 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - NOVEMBER 07: Sandra Bullock, Cate Blanchett and Rihanna are seen filming 'Ocean's 8' in Central Park on November 7, 2016 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - OCTOBER 31: Sandra Bullock and Cate Blanchett are seen filming 'Ocean's 8' on October 31, 2016 in Queens borough of New York City. (Photo by Alessio Botticelli/GC Images)
NEW YORK, NY - OCTOBER 24: Actress Sandra Bullock (R) and Cate Blanchett are seen on the set of 'Ocean's Eight' on October 24, 2016 in New York City. (Photo by Raymond Hall/GC Images)
LOS ANGELES, CA - JANUARY 06: Actress Sandra Bullock accepts the Favorite Movie Actress award onstage during the People's Choice Awards 2016 at Microsoft Theater on January 6, 2016 in Los Angeles, California. (Photo by Lester Cohen/WireImage)
LOS ANGELES - JANUARY 6: Sandra Bullock and Melissa McCarthy backstage at the PEOPLE'S CHOICE AWARDS 2016, from the Microsoft Theater on Wednesday, Jan. 6, 2016 (9:00-11:00 PM, live ET/delayed PT) on the CBS Television Network. (Photo by Francis Specker/CBS via Getty Images)
NEW YORK - OCTOBER 29: Sandra Bullock seen out in Manhattan on October 29, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - OCTOBER 29: Sandra Bullock is seen heading to Today TV Show on October 29, 2015 in New York City. (Photo by Alessio Botticelli/GC Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0355 -- Pictured: Actress Sandra Bullock on October 28, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - OCTOBER 28: Sandra Bullock Visits 'The Tonight Show Starring Jimmy Fallon' at Rockefeller Center on October 28, 2015 in New York City. (Photo by Theo Wargo/NBC/Getty Images for 'The Tonight Show Starring Jimmy Fallon')
HOLLYWOOD, CA - OCTOBER 26: Actress Sandra Bullock attends the premiere of 'Our Brand Is Crisis' at TCL Chinese Theatre on October 26, 2015 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
HOLLYWOOD, CA - OCTOBER 26: Actress Sandra Bullock arrives at the premiere of Warner Bros. Pictures' 'Our Brand Is Crisis' at TCL Chinese Theatre on October 26, 2015 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
BEVERLY HILLS, CA - OCTOBER 17: Sandra Bullock at the 'Our Brand Is Crisis' Press Conference at the Four Seasons Hotel on October 17, 2015 in Beverly Hills, California. (Photo by Vera Anderson/WireImage)
TORONTO, ON - SEPTEMBER 12: Actresses Sandra Bullock (L) and Zoe Kazan attend the 'Our Brand Is Crisis' press conference at the 2015 Toronto International Film Festival at TIFF Bell Lightbox on September 12, 2015 in Toronto, Canada. (Photo by Jason Merritt/Getty Images)
TORONTO, ON - SEPTEMBER 12: Actress/producer Sandra Bullock speaks onstage during the 'Our Brand Is Crisis' press conference at the 2015 Toronto International Film Festival at TIFF Bell Lightbox on September 12, 2015 in Toronto, Canada. (Photo by George Pimentel/WireImage)
TORONTO, ON - SEPTEMBER 12: (L-R) Executive Producer/actress Sandra Bullock, Producer Grant Heslov and actress Zoe Kazan attend EW's Must List Party during the 2015 Toronto International Film Festival at Thompson Hotel on September 12, 2015 in Toronto, Canada. (Photo by John Shearer/Getty Images for Entertainment Weekly)
TORONTO, ON - SEPTEMBER 11: Actress Sandra Bullock attends the 'Our Brand is Crisis' premiere during the 2015 Toronto International Film Festival at the Princess of Wales Theatre on September 11, 2015 in Toronto, Canada. (Photo by Jason Merritt/Getty Images)
TORONTO, ON - SEPTEMBER 11: Actress Sandra Bullock attends the 'Our Brand is Crisis' premiere during the 2015 Toronto International Film Festival at the Princess of Wales Theatre on September 11, 2015 in Toronto, Canada. (Photo by Jason Merritt/Getty Images)
TORONTO, ON - SEPTEMBER 11: Executive Producer/Actress Sandra Bullock (L) and Producer George Clooney arrive to the 'Our Brand Is Crisis' photo call at Princess of Wales Theatre on September 11, 2015 in Toronto, Canada. (Photo by John Shearer/WireImage)
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Feeling safe is a luxury that Bullock's character in Bird Box doesn't get a chance to enjoy. The film -- which tells the post-apocalyptic story of a world under attack by creatures that can kill you just by looking at them -- deals a lot with the nature of fear and its impact on your life.

One of the fears Bullock's character faces in the tense thriller is the decision and consequences of being a mother, and bringing new life into a challenging world. 

However, in the actress' real life, Bullock says she never felt any fear of motherhood, and actually embraced the prospect early on.

"I would have been pregnant or knocked up at 17," the Oscar winner shared. "I wanted to be a mom at a very young age. So I kind of felt the drive and the desire to."

Bullock added that there's one main reason why that didn't happen.

"My mother knew that and she kept me under lock and key," the actress explained.

11 PHOTOS
Sandra Bullock and her father together
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Sandra Bullock and her father together
Actress Sandra Bullock and father John Bullock attend the 'Forces of Nature' Westwood Premiere on March 12, 1999 at Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Actress Sandra Bullock and father John Bullock attend the 'Forces of Nature' Westwood Premiere on March 12, 1999 at Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
UNITED STATES - MAY 29: Sandra Bullock and father at the 1996 People's Choice Awards in Beverly Hills, 02/10/96 (Photo by Vinnie Zuffante/Getty Images)
Actress Sandra Bullock and dad John Bullock attend the 22nd Annual People's Choice Awards on March 10, 1996 at Universal Studios in Universal City, California. (Photo by Ron Galella, Ltd./WireImage)
Actress Sandra Bullock and dad John Bullock attend the 22nd Annual People's Choice Awards on March 10, 1996 at Universal Studios in Universal City, California. (Photo by Ron Galella, Ltd./WireImage)
UNITED STATES - MAY 29: Sandra Bullock and father at the 1994 Golden Globe Awards in Beverly Hills, 01/21/95 (Photo by Vinnie Zuffante/Getty Images)
379492 01 : 3/12/99 Los Angeles, CA Ben Affleck, Sandra Bullock, and father attend the premiere of their new movie 'Forces of Nature.'
Actress Sandra Bullock (2nd from L) and father John Bullock (L) and mother Helga laugh with astronaut Buzz Aldrin (R) at the Lombardi Gala in Washington, D.C. October 3, 1998 to benefit cancer research. (photo by Karin Cooper)
Sandra Bullock and Father (wearing Calvin Klein) during 53rd Annual Golden Globe Awards at Beverly Hilton Hotel in Beverly Hills, California, United States. (Photo by The LIFE Picture Collection/Getty Images)
Sandra Bullock and father (Photo by Ron Galella/WireImage)
(Original Caption) Actress Sandra Bullock with her father. (Photo by Ronald Siemoneit/Sygma/Sygma via Getty Images)
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Bullock became a mom for the first time in 2010 when she adopted son Louis, and welcomed daughter Laila into her life via adoption in 2015.

Recently, ET sat down with Bullock and her Bird Box co-star, Trevante Rhodes, and the actress revealed how her time as a mom helped to inform her role, especially when it came to becoming a fierce protector of her children, on-screen, against the film's menacing danger. Check out the video below to hear more.

Bird Box debuts Dec. 21 on Netflix.

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