Demi Lovato candidly discusses life before sobriety: 'I was a nightmare to work with'

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Demi Lovato is mindful of not returning to her old habits.

The Confident singer candidly addresses her past struggles with sobriety in a new interview with Refinery29, detailing how getting clean has required her to make significant changes in her life.

"I had to learn the hard way that I can't do parties anymore," the 23-year-old singer reveals. "Some people can go out and not be triggered, but that's not the case for me."

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Telling the publication that at her lowest point, she was unable to go an hour without cocaine, she would resist her parents' discipline by saying, "Try to ground me — I pay your bills."

"Prior to getting sober, I was one of those people who was like, I don't give a f**k, whatever," she adds. "And I used that as an excuse to do whatever I wanted. I was a nightmare to work with."

Lovato celebrated four years of sobriety in March, telling ET that when it comes to staying clean, "I think what inspires me is remembering that I deserve to be the best that I can be and also knowing people look at me as a role model - it gives me the fire to continue to be strong."

Of course, sobriety is a lifelong battle, and Lovato tells the publication that she had to resist the urge to watch the Oscar-winning documentary Amy, about the troubled life of late singer Amy Winehouse.

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"To see white powder in a movie.... To see someone shooting up?" she says. "It's too triggering. If I feel even 1% unsure that I'm in a place where I can watch it, then I just don't do it."

And Demi understands that even through all of her positive strides, she still has her detractors.

"I'm still underestimated... I still have more things to prove – not just about the things I can do with my voice," she says. "Some people think that because I'm young, I can't stay sober. But these are things I want to prove to myself."

WATCH: Demi Lovato Says Wilmer Valderrama Is More 'Passionate' Than Past Boyfriends, Commends Kesha

Apart from sobriety, Lovato addresses a number of things in the interview, including her relationship with Wilmer Valderrama. While the singer said last year she would say "Yes" if her boyfriend ever proposed, the couple is keeping those details to themselves, for now.

"It's nobody's business but ours, and when it happens, it happens," she says.

See Lovato through the years:

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Demi Lovato through the years
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Demi Lovato candidly discusses life before sobriety: 'I was a nightmare to work with'
Singer Demi Lovato performs during KIIS-FM Wango Tango concert at StubHub Center in Carson, U.S., May 14, 2016. REUTERS/Mario Anzuoni
Singer Demi Lovato arrives at the Metropolitan Museum of Art Costume Institute Gala (Met Gala) to celebrate the opening of "Manus x Machina: Fashion in an Age of Technology" in the Manhattan borough of New York, May 2, 2016. REUTERS/Eduardo Munoz
Singer Demi Lovato poses at the 2016 iHeartRadio Music Awards in Inglewood, California, April 3, 2016. REUTERS/Danny Moloshok
Singer Demi Lovato arrives at the 58th Grammy Awards in Los Angeles, California February 15, 2016. REUTERS/Danny Moloshok
Singer Demi Lovato arrives at the 2015 American Music Awards in Los Angeles, California November 22, 2015. REUTERS/David McNew TPX IMAGES OF THE DAY
WEST HOLLYWOOD, CA - AUGUST 18: Demi Lovato attends the Samsung launch party on August 18, 2015 in West Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - JUNE 25: Demi Lovato visits 'The Elvis Duran Z100 Morning Show' at Z100 Studio on June 25, 2015 in New York City. (Photo by Robin Marchant/Getty Images)
LOS ANGELES, CA - JULY 05: Singer Demi Lovato performs at 102.7 Kiis FM's Cool For The Summer' Pool Party at the WaterMarke Tower on July 5, 2015 in Los Angeles, California. (Photo by Michael Buckner/Getty Images)
Demi Lovato speaks on stage at unite4:good and Variety's 2nd annual unite4:humanity at the Beverly Hilton Hotel on Thursday, Feb.19, 2015, in Beverly Hills, Calif. (Photo by Chris Pizzello/Invision/AP)
NEW YORK, NY - JUNE 06: Demi Lovato performing on the Mudd Stage at Digifest on June 6, 2015 in New York City. (Photo by Craig Barritt/Getty Images for MUDD)
Demi Lovato arrives at the Roc Nation Pre-Grammy Brunch at RocNation Offices on Saturday, Feb. 7, 2015, in Beverly Hills, Calif. (Photo by Rob Latour/Invision/AP)
Singer Demi Lovato performs on ABC's "Good Morning America" in Central Park on Friday, June 6, 2014, in New York. (Photo by Greg Allen/Invision/AP)
SANTA MONICA, CA - OCTOBER 08: Singer/actress Demi Lovato attends the Vevo CERTIFIED SuperFanFest presented by Honda Stage at Barkar Hangar on October 8, 2014 in Santa Monica, California. (Photo by Jason Kempin/Getty Images for VEVO)
TAMPA, FL - DECEMBER 22: Demi Lovato performs onstage during 93.3 FLZ’s Jingle Ball 2014 at Amalie Arena on December 22, 2014 in Tampa, Florida. (Photo by Tim Boyles/Getty Images for iHeartMedia)
LOS ANGELES, CA - JANUARY 20: President of Island Records David Massey (L) and Demi Lovato celebrate Nick Jonas' song 'Jealous' being the #1 At Top 40 radio hit at The Ivy on January 20, 2015 in Los Angeles, United States. (Photo by Charley Gallay/Getty Images for Island Records)
Demi Lovato performs onstage during 93.3 FLZ's Jingle Ball 2014 at Amalie Arena on Friday, Dec. 22, 2014, in Tampa, Florida. (Photo by John Davisson/Invision/AP)
Demi Lovato performs on stage at Staples Center on Saturday, September 27, 2014, in Los Angeles. (Photo by Paul A. Hebert/Invision/AP)
Becky G performs on stage at Staples Center on Saturday, September 27, 2014, in Los Angeles. (Photo by Paul A. Hebert/Invision/AP)
Christina Perri performs on stage at Staples Center on Saturday, September 27, 2014, in Los Angeles. (Photo by Paul A. Hebert/Invision/AP)
IMAGE DISTRIBUTED FOR POP-TARTS - Ryan Beatty, left, and Demi Lovato had a #CrazyGoodSummer at South Side Ballroom on Thursday, July 17, 2014, in Dallas, Texas. (Photo by Brandon Wade/Invision for Pop-Tarts/AP Images)
Singer Demi Lovato performs on stage at the Air Canada Centre on Wednesday, March 26, 2014, in Toronto, Canada. (Photo by Arthur Mola/Invision/AP)
TAMPA, FL - DECEMBER 22: Demi Lovato performs onstage during 93.3 FLZ’s Jingle Ball 2014 at Amalie Arena on December 22, 2014 in Tampa, Florida. (Photo by Gerardo Mora/Getty Images for iHeartMedia)
SANTA MONICA, CA - OCTOBER 08: Recording artist Demi Lovato performs onstage during the Vevo CERTIFIED SuperFanFest presented by Honda Stage at Barkar Hangar on October 8, 2014 in Santa Monica, California. (Photo by Christopher Polk/Getty Images for Vevo)
INGLEWOOD, CA - AUGUST 24: Singer Demi Lovato attends the 2014 MTV Video Music Awards at The Forum on August 24, 2014 in Inglewood, California. (Photo by Christopher Polk/Getty Images for MTV)
SUNRISE, FL - DECEMBER 20: Demi Lovato attends Y100’s Jingle Ball 2013 Presented by Jam Audio Collection at BB&T Center on December 20, 2013 in Miami, Florida. (Photo by Gustavo Caballero/Getty Images for Clear Channel)
LOS ANGELES, CA - DECEMBER 16: Singer Demi Lovato performs onstage during 'VH1 Divas' 2012 at The Shrine Auditorium on December 16, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
LOS ANGELES, CA - JANUARY 11: Singer Demi Lovato arrives at the 2012 People's Choice Awards held at Nokia Theatre L.A. Live on January 11, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - JANUARY 11: Singer Demi Lovato arrives at the 2012 People's Choice Awards held at Nokia Theatre L.A. Live on January 11, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
UNIVERSAL CITY, CA - AUGUST 07: Singer/actresses Demi Lovato (L) and Selena Gomez arrive at the 2011 Teen Choice Awards held at the Gibson Amphitheatre on August 7, 2011 in Universal City, California. (Photo by Jason Merritt/Getty Images)
TINLEY PARK, IL - AUGUST 06: Demi Lovato attends the Summer Camp Rock 2 Concert Tour kick off at First Midwest Bank Amphitheatre on August 6, 2010 in Tinley Park, Illinois. (Photo by Barry Brecheisen/Getty Images for Juicy Juice)
LOS ANGELES, CA - JANUARY 06: Actress Demi Lovato poses in the press room during the People's Choice Awards 2010 held at Nokia Theatre L.A. Live on January 6, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for PCA)
LOS ANGELES, CA - MARCH 28: Actress Demi Lovato arrives at Nickelodeon's 2009 Kids' Choice Awards at UCLA's Pauley Pavilion on March 28, 2009 in Westwood, California. (Photo by Kevin Winter/Getty Images)
NEW YORK - JUNE 11: Actress Demi Lovato attends the premiere of 'Camp Rock' on June 11, 2008 in New York. (Photo by Scott Gries/Getty Images)
LOS ANGELES, CA - SEPTEMBER 07: Singer Demi Lovato arrives at the 2008 MTV Video Music Awards at Paramount Pictures Studios on September 7, 2008 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)
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One thing Lovato has been vocal about is her support for her friend Kesha, who finds herself embattled in a legal struggle with her former producer, Dr. Luke, who she accuses of sexually assaulting her. Dr. Luke has called those claims "outright lies."

WATCH: Demi Lovato Reveals Wilmer Valderrama Had 'Some Hesitations' About Their Age Difference

"There's way too much shame put on victims coming forward talking about being date-raped, raped, sexually abused," she tells the magazine. "So then people feel like they can't come forward anymore because they'll just be torn to shreds."

To Lovato, support of other women is a critical element to feminism.

"My thing is, don't brand yourself a feminist if you don't do the work," she says. "I have an immense amount of respect for women like Lena Dunham... or Beyoncé, who make amazing political statements through their work."

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