my best friend likes me!!?

I have this amazing best friend. I mean she's been there for me since grade 9. and we are now in grade 11. we are both girls. i dont like girls im straight, shes lesbian. She told me that she likes me and i give her alot of respect for telling me that. But thing got awkward. and i just get annoyed with her. I feel bad that im mean to her sometimes but she is just frustrating. Like shes always asking to hang out with me outside of school and i feel uncomfortable. and in class she'll do something (like get up and get a piece of paper) and she'll look at me cuz she thinks im looking at her. I love her (like a best friend) but she really loves me. more then a best friend. And she knows that i dont go that way. she keeps asking me to sleepover and i dont want to bcuz she mite try something. please help me. what do i do. ?? OH and whenever i talk about my BOY crushes she'll be like "OMG u like to many guys." And one more thing is she'll text me "I need a gf, i feel so lonely!" im just like "besty ur 17 wait for love to come to u. stop stressin."