The Top Gun star told SheWired that she found it difficult to accept that that she was gay when she was younger.
McGillis said: "I'm done with the man thing. I did that, I need to move on in life. That's another part of being true to yourself and it's been a challenge for me, personally.
"I think that was an ongoing process from the time I was 12, it was a long, arduous journey for me."
She added: "I had a lot of things happen that convinced me that God was punishing me because I was gay, so that was a hard process for me.
"Life is a freaking journey, and it's about growing and changing and coming to terms with who and what you are and loving who and what you are."