I would be more worried that you couldn't get hard enough. That's a serious problem! Has it ever happened after that?
Look, I don't have to tell you this but I will. I was sexually molested for years when I was little by my uncle. He gave me BJ's and I had to give them to him. Sometimes he wanted to be fucked. After a while I started to wonder why this was happening to me. Did I like it? Did I want it to happen? Maybe I'm gay. When I was old enough I started to understand that when you are gay the only person in the world that can tell you for sure you are is YOU!!! Nobody else. My advice to you is find out what you like and if that turns out to be men you're gay or at least bisexual. Uncertainty is killin. And if you gay enjoy it. I've got 2 daughters and 1 son and if one of them should turn out to be gay I wouldn't love them any less.
I am proud of you for sharing something most people would keep a secret.
As for the forum you read, assholes have opinions, caring people give good advice and answers to your questions.
Sorry for the spells. English isn't my first or second language.