Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
Now here's the thing. I'm definitely bi, like in love with a man right now kind of bi. One thing though, I'm not interested in anal sex at all. Blow jobs, sure, mutual masturbation, yep, anal, no way. If you're bi or gay it doesn't mean you have to be into everything bi or gay. It would take a lot for me to try out anal, and I don't think I ever want to if I can help it (people poop from that hole!) If I'm looking up porn, I can get off to a masturbating man, or two guys giving blowjobs to each other, but as soon as the anal starts I lose it.
Now in your case, are you attracted to men in any sense? Is it like me where there's a certain thing that I dislike about the bi/gay life? Or are you just not turned on by men at all? From what you say, someone suggesting you may be gay made you questions yourself, when in reality, no one should suggest what you are/aren't. Only you know what's going on in your head and only you can determine that answer. Don't let others influence what you feel and do.