Is this a phase? Why am I so sexually confused?

For a long while now, I've been more sexually attracted to men than anything else. However, I also like women, I've never had sex with one and I do find them attractive, but I'm rather anti-social and I haven't had a girlfriend at all, and the girls that I like don't like me. I've mainly been fantasizing about having sex with men and have begun again with women (I'm not as erected) though I'm only attracted to their physical body and barely emotional. Women are less attractive to me (in most porno anyway and I can't really get it up with just looking at them, though I feel like I want to be with them), but I do want to date them. I really want to be with both sexes, am I bisexual? I do remember fantasizing about having sex with women in middle school, I was amazed by sex itself.