Not sure of my sexuality

I know I like boys because I've had a crush on one for almost two years now, but I honestly don't know if I like girls. There's this one girl who I think is really pretty and really nice, and I admire her, but I don't know if my admiration is sexual or not. And if it is, I wouldn't care, but I really don't think that my parents would accept me. I know that people at school and my brother would, but based on the past behaviors of my parents, especially my mom, there would be no way that I could tell them and hope to be accepted.