What should I do about this girl, is she playing me or for real..PLEASE ANSWER?

Alright so first off im 17 shes 14 and we met through school. I friended her on facebook and liked her picture and she messaged me to talk. We became friends and flirted with each other and 2 weeks later i asked her on a date and we had a great time. she said i was perfect and she was very happy we kissed at the end. then we hung out another time at my friends house and we madeout. She texts me first alot and always says how cute i am as i say to her. she really seems to like me. I cant really explain to well in detail but i just can tell. the thing is she is very goodlooking and has a lot of guys who talk to her. she has kissed but not too many and has only had one boyfriend. I am wondering if im just a hook up to her or not. she is away for a couple of days and i want to ask her whats the deal with us. i really like her and i want a relationship. my good friend says that she isnt good for me. we are married on facebook so i guess im special to her in some way. what do i say to her that well not lead me to a fight