I like this girl and everytime we talk she kinda has an attitude. But I still love her. I really dont have this feelings with anyone but she is so beatuiful. Everytime we are in class I try not to stare at her. Should I tell her how I feel or just keep being friends.

Maybe you could write her a poem about how beautiful you think she is. Girls love compliments. And if she is anything like me.. Gosh, I would love it if my boyfriend wrote me a poem.
Anyway, it's normal. You're obviously young. Just tell her. See how she feels. If she likes you too, weight lifted. If she doesn't feel the same, you can move on.
Do something charming though :I