I do, sometimes, wonder if I'm not really bi, and then stop for a moment to analyze my feelings towards men - those guys I found cute or datable, did I really want to date them? - and keep open to the possibility of eventually liking one, despite of the little voice in my head that says 'guys? Ewwww!'. Having gone through quite a hell and maturing a bit, I now feel comfortable with calling myself a lesbian, since the very thought of kissing a guy is disgusting to me, but the idea of kissing a woman is wonderful.
Then, due to family pressure, I went back in the closet and did what I could to have a straight identity - I even dated a guy! But I kept on dreaming of girls, and fell in love with one again. Mainly because, when I first fell in love with a girl, I opened up to the world as a bissexual. Hi there, DevilKisses (an EttyT), I get that questioning you're going through.
