I REALLY like this girl?

so I am a sopre guy. Never had a girlfriend before haha. I hated my last school so I switched to a very small private Christian school. In my grade there is THE prettiest girl I have ever seen. She is so nice. Really fun to talk to and really cool. I try and talk to her as much as possible without bothering her ;). I told some people at the beginning of the year and it got out but I said I just wanted to be friends. I REALLY like her still lol. I've done things like we met early at school and I bought her a smoothies thing for like $5 and brought it to her. I've made her a cd of her favorite rapper. I have bought her mtn dew. You get the picture lol. Well I think she might like have a "thing" with a junior. He's super tall and a bball player and they went to dinner last week but they aren't a couple yet sooo... Idk haha. People have said I have more of a chance with her then like 75% of my whole cl haha. I've told her things too like she's really pretty in a text. But she's coming to my party this Friday. What should I do? I don't wanna get rejected but don't want my girl to get taken by another guy. Thanks. Oh yeah should i talk to her more? And I walked outside to sit by her In lunch and the last thing I heard is "idk if I like him he can't hold a conversation". I don't think that's me but idk. Thanks. Sorry for the length but thanks for answering!!