"I feel so incredibly grateful to all of the people who've reached out to me directly or indirectly or just in spirit and I feel really, really like my entire future is laid out in a different way and it's thrilling and scary and overwhelming," said Quinto at the premiere of his film "Margin Call" Monday night in New York.
The 34-year-old looks forward to the day when saying you're gay "won't be hard" and won't matter.
"There've been people on this path who were much bigger trailblazers than me who did this at a time when it was even harder...and if me standing up and making some kind of acknowledgement and declaration helps that then I can't ask for anything more out of my life."
Quinto is best known for playing Spock in the latest "Star Trek" movie and for the TV show "Heroes."
He not only acts in "Margin Call" but also serves as an executive producer.
The film focuses on a group of bank employees during a 24 hour period as the 2008 financial crisis is about to hit. It stars a roster of celebrities including Kevin Spacey, Demi Moore, Simon Baker and Penn Badgley.
"Margin Call" opens October 21.