I'm confused about my sexuality.

I'm in my early teens so I feel that figuring out my sexuality is going to take some time, but it's driving me crazy! I came out as bi a year ago. I was positive that I was attracted to both males and females, but now I'm not so sure. I'll start from the beginning. I used to think that being attracted to the same sex was weird, gross even. I later found that I was beginning to like the idea of dating a girl and almost wanted to be bi or a lesbian. I figured that I was more into 'boy stuff' like video games and liked hanging out with boys more than I did girls, so I thought that I must be gay. I've dated a boy, but there was nothing there and I've never had a crush on a boy. It's probably because I'm so young. I was starting to think that maybe I was actually straight. Right now I have a crush on a girl. I don't know if it's a deep admiration or that I'd like to be like her. We've never really talked. Yeah, we talk to each other during lessons at school but never at breaks or outside of school. I've also been going through a phase of 'men are gross and I never want to date one,' and now I've found myself being attracted to them as well as women. I'm just really confused about my sexuality and need some advice. Sorry for the long post and thanks for reading.