About a complicated relationship. PLEASE HELP!?

So i'm a freshman in highschool and i'm in a situation with a girl right now that i dont really understand. So this girl and i talk every night and we hung out on this past weekend and she wants to hang out more. She likes almost all my pictures on facebook and i am almost always in her prof. pics. we go to school together and have 4 classes together we hang out in all of them. I am ready to move on with the relationship but i think she just wants a good friendship with me but i'm not sure(and she doesn't think i'm gay) a few of my friends have talked to her about it and she said we were just friends and that she only sees me as a friend but idk if she's lying because some of her friends thinks she likes me. Please help i don't know what to do.