am i possibly busexual?

For the past few years I have been very unsure of my sexuality, but I want to know what you guys think.

So for starters I am a 15 yo guy in high school, and for a while now I have had theese dreams of having sex with another guy, no guy in particular... But it's weird. On the other hand, I really like a handful of girls at school and have wanted to be in a relationship with them but I am scared they will reject me. (like everybody else in my school.) on top of being unsure and emotional about my sexuality , I am made fun of ALOT at school being called gay and ****** and everything else. But the problem is, is that I am almost afraid of being gay... Most of the "openly gay" kids in my school are picked on even worse that me, and my life is miserable enough as it is. But with all of the dreams and fantasies I have had I am starting to believe I am gay and I am very uncomfortable with the subject. I have also seriously thought about having children as an adult. Sorry for the long question... But any ideas?? I am very unsure of this all.