..am I a lesbian????

Hi I'm in year 7 at high school and there is this girl in year 8 who is really pretty and I'm desperate to be friends with her. I try not to stare at her too much and I sometimes perv at her photos too.. When I see pictures of her friends I suddenly get jealous and wish I was in year 8 with her. I feel like crying over it.. What's up with me??