questioning my sexuality

I am in jr high. I am really questioning my sexuality. I have a crush on this guy. On my Dive team, but I also am reall attracted to his sister. Like in love with her. I haven't told anyone and I am holding in tears writing this. I don't know if this means I am bisexual or lesbian. I don't know how to come out to my friends, I think that if I told them they would think of me like a freak. They might think that I am attracted to them. They might never come to my house again. I also don't know how to make a move towards the girl I like. I don't even know if she is attracted to girls. Just please help me.