British Olympian Tom Daley and Australian singer Troye Sivan are just two of the big names who have used the platform for this purpose.
But 19-year-old Mills' video is a particularly emotional ride.
She begins by explaining that she gets a lot of questions about her sexuality on her channel, and that she's always repressed the fact that she likes girls along with boys.
Mills, who has nearly 700,000 subscribers, also shares that the first person she ever came out to was fellow YouTuber Dion York, who she met in Toronto and came out to after knowing him for under an hour.
She goes on to tell some of her friends, but not before making them draw who they think she has a crush on based on some simple characteristics including hazel eyes, tattoos and a good taste in music.
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Mills asked her friends to draw her crush.
Elle Mills
Though they all draw boys, they're excited when she shows them a photo of the girl she actually likes.
"You can't be gay, I'm gay," one of her friends jokes.
The video takes a deeply emotional turn, though, when Mills talks through tears about coming out to her family and how nervous she is about their reactions.
"I'm scared that my relationships with the people in my life right now are going to be different, people are going to look at me differently."
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Mills became emotional when she spoke about coming out to her family.
Elle Mills
With the help of her friends, Mills covers her house with rainbow-coloured wrapping paper and waits for her family.
When her mother and brother pull up to the house, they immediately hug Mills and tell her that they accept her.
"Hi, I'm Elle Mills, and I'm bisexual," she concludes the adorable video.
Reactions to the video have been overwhelmingly positive.
Mills acknowledged the positive comments on Twitter, and thanked her followers for their support.
Also on HuffPost:
Famous LGBTQ Canadians
Jenna Talackova(01 of21)
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B.C.-born model Jenna Talackova made waves in 2012 when she was initially disqualified from competing in the Miss Universe Canada competition because she's transgender. She later mounted a legal challenge and the decision was reversed. She would go on to star in the reality show "Brave New Girls." (credit:Getty Images)
Lucas Silveira(02 of21)
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Lucas Silveira is the lead singer and guitarist for Toronto-based alternative act The Cliks. (credit:AP)
Rae Spoon(03 of21)
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Transgender singer/songwriter Rae Spoon doesn't identify as female or male, instead preferring the pronoun "they." (credit:Rae Spoon)
Wendy Crewson(04 of21)
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Hamilton, Ont.-born actress who has starred in films such as "Air Force One," "The 6th Day" and shows such as "24" and "Saving Hope." The 58-year-old came out in December, and said she was "scared to death" to tell her kids. (credit:Alberto E. Rodriguez via Getty Images)
Dionne Brand(05 of21)
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An author and poet (and former poet laureate of Toronto), Brand's works often focus on discrimination about the LGBTQ community.
Ann-Marie MacDonald(06 of21)
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Playwright, author, actress, CBC host. Her novels "Fall on Your Knees" and "The Way the Crow Flies" were shortlisted for the Giller Prize. Her play "Goodnight Desdemona (Good Morning Juliet) won the Governor General's Award. She has also hosted CBC's "Life and Times" and "Doc Zone." (credit:Canadian Press)
Svend Robinson(07 of21)
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Svend Robinson became the first politician to come out in office in 1988, while serving as an NDP MP in Burnaby, B.C. (credit:CP)
Adamo Ruggiero(08 of21)
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After playing a gay character on Degrassi, actor Adamo Ruggiero came out in an eTalk interview, saying, ""I thought, you know, I was learning and I learned and what better way to kind of share my knowledge than right now." (credit:Toby Canham via Getty Images)
Mark Tewksbury(09 of21)
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Olympic gold medallist in 100-metre backstroke at the 1992 Games in Barcelona. (credit:ASSOCIATED PRESS)
Kathleen Wynne(10 of21)
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Ontario's first female premier was first elected to the legislature in 2003, and became leader of the provincial Liberal Party in 2013. She later led her party to victory in the 2014 provincial election. (credit:Getty Images)
Rex Harrington(11 of21)
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Rex Harrington (left, with fiance Bob Hope) was a principal dancer with The National Ballet of Canada from 1988 to 2004. He and Hope competed on the second season of "The Amazing Race Canada." (credit:CTV)
Toller Cranston(12 of21)
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Cranston was a bronze medal-winning figure skater at the 1976 Olympics who was credited with revolutionizing the sport. He died in January, aged 65. (credit:Getty Images)
Andy Quan(13 of21)
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Vancouver-born author and poet Andy Quan writes frequently about gay issues, and has worked to fight for better policies for those living with HIV and AIDS.
Gloria Eshkibok(14 of21)
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This singer and actress has appeared on a multitude of stages, including Bruce McDonald's film "Dance Me Outside," about a native reservation in northern Ontario. (credit:CLGA.ca)
Brian Orser(15 of21)
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Brian Orser (seen here with Japan's Yuzuru Hanyu) is an ex-figure skater who won a silver medal at the 1984 Olympic Games in Sarajevo. He would later coach skaters Kim Yu-Na and Hanyu to Olympic gold medals. (credit:ASSOCIATED PRESS)
Shyam Selvadurai(16 of21)
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Author of four novels and many more short stories, Selvadurai immigrated to Canada from Sri Lanka at the age of 19.
Rufus Wainwright(17 of21)
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Montreal-raised singer/songwriter and the son of folk singers Kate McGarrible and Loudon Wainwright III. Won Juno Awards for his self-titled debut album and his 2001 effort "Poses." His debut also saw Rolling Stone recognize him as "Best New Artist." (credit:Evan Agostini/Invision/AP)
Owen Pallett(18 of21)
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This Canadian composer and Arcade Fire collaborator was nominated for an Academy Award for scoring the movie "Her" alongside William Butler. (credit:Stuart C. Wilson via Getty Images)
Gary Paterson(19 of21)
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Vancouver minister Gary Paterson became the United Church of Canada's first openly gay moderator in 2012. (credit:Flickr/United Church of Canada)
Wade MacLauchlan(20 of21)
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Wade MacLauchlan became the first openly gay premier of Prince Edward Island in the 2015 election. He also previously served as president of the University of Prince Edward Island. (credit:CP)