Am I gay?

Yup, you gay.
Well you might like women, but no straight guy would do any of that.

Ha, ten years too late. Grow up.

Fine. OP is definitely bi. No straight male showers with another boy and lets him "grind" on him.

You don't know what sexuality is. Ignorance-game is strong.

I think you'll find many do... it's called having an experience.

Oh and FYI, if he likes women then he is heterosexual. That is what being heterosexual means.

If you feel the need to ask the question if you're gay, then you are definitely at least bi curious. Ask as many heterosexual men if they would consider OP heterosexual. My "ignorance-game " isn't anything. No straight man would want another man "grinding" on him.

No, no they don't. I have never met a straight guy who has done that and I have met a vast amount of guys. Don't use the internet as you base for "many" as it is an inherent echo chamber.

Or he is bisexual. That is a thing as well.

Absolute filth.

You have never met a heterosexual man who admitted it to you, no. I, however, have. You are incorrect. I assure you I have more experience of understanding sexuality than you do.

Okay, I'm sorry but are you going to actually make up your mind? First it was homosexual, then bisexual, now bi-curious. Decide, pal. I actually could not care less about what a lot of heterosexuals consider. Many heterosexuals have never had to learn about sexuality and understand it, hence why the world is full of so many anti-gay bigots because it is ignorant to the reality of the issue.

Sexuality is defined by sexual attraction. The OP clearly stated he was not sexually into the boy. I have had sexual 'experiences' with a girl and would never do them again and am not remotely sexually attracted to women. You are wrong.

You have met one? Right, that is clearly all "most"

I'm not sure, I'm not OP. He is definitely not straight. "You could not care less what heterosexuals consider?" Now, who is being ignorant?! The end of the paragraph is a sweeping generalisation. Plenty of straight males are educated about sexuality.
Do you think OP is being wholly honest about not being attracted to the boy? Even slightly? Why else would he let him "grind" on him? Would you let a boy grind on you, if you weren't attracted to him? It's illogical.

Well, it is true that I don't have a girlfriend at the moment but I have exes. As for having a fetish of being dominated, I'll have to think about that one.