I am 22, and I guess I am what some might call a "repressed" bisexual. I definately am attracted to women, every kind of woman, but I know I am attracted to some men, too. I'm not really ashamed of this, because I can't change it. I have felt this way since I went through puberty. I just don't want to outright label myself "bi" or whatever. I can't deal with that kind of thing in my life right now.
Don't worry about your feelings. It doesn't matter if you're gay, straight, bi, whatever! You can't change it. Even if you are gay, there is nothing wrong with it. It's like hating yourself because you have brown hair or blue eyes. It's beyond your control.