Am i bisexual? Help!!?

I have always liked boys, but lately I have been wondering if thats all. I look at girls, but never thought anything of it before. I sometimes look at there chest area, and when I think about being bi, I get that feeling you get when you like someone. The thing is, kissing a girl doesnt sound gross at all. (Im only 14, so other sexual things of BOTH genders sounds gross) I dont know how i feel about dating a girl, because not a single girl at my school is publicly lesbian or bi, so that wouldnt work. Plus I would feel awkward dating a girl, but only because my school is very set on the gir and boy only couples. What do i do? and am I bi?