The "Juno" star made the announcement in Las Vegas at the Human Rights Campaign's THRIVE conference benefiting LGBTQ youth.
The star the upcoming X-Men: Days of Future Past made the announcement in a moving and deeply personal speech delivered at Time to THRIVE, a conference to promote the welfare of LGBT youth held at Bally's Hotel and Casino in Las Vegas, Nevada.
"I’m here today because I am gay," Page, 26, told the audience "And because maybe I can make a difference. To help others have an easier and more hopeful time. Regardless, for me, I feel a personal obligation and a social responsibility."
Page first shared the inner turmoil she's felt since she thrust into the Hollywood limelight following the blockbuster success of 2007's Juno.
"It’s weird because here I am, an actress, representing -- at least in some sense -- an industry that places crushing standards on all of us," Page said. "Not just young people, but everyone. Standards of beauty. Of a good life. Of success. Standards that, I hate to admit, have affected me."
"You have ideas planted in your head, thoughts you never had before, that tell you how you have to act, how you have to dress and who you have to be. I have been trying to push back, to be authentic, to follow my heart, but it can be hard," she admitted.
Page added that reading about herself in the tabloids can be a trying ordeal, and mentioned one article, accompanied by a paparazzi photo of her wearing sweatpants on the way to the gym, that asked, "Why does this petite beauty insist upon dressing like a massive man?" (The answer: "Because I like to be comfortable.")
That kind of gender stereotyping serves "no one," Page said. She then went on to single out examples of "courage all around us," naming "football hero Michael Sam," Orange Is the New Black star Laverne Cox and musicians Tegan and Sara Quinn for their contributions to furthering LGBT visibility and pride.
Time to THRIVE organizer Human Rights Campaign tweeted the news shortly after Page made her remarks, which they later posted in full to their website.