I like this girl and she... plz helpp?

Well, I think you should go out with another girl just once to see what she does. If she doesn't take notice of it, she might not like you. If she acts like she's jealous or mean than she might like you. If she does act like that, then you should just talk to her and tell her that she needs to act her age. Don't wait for her to realize that you aren't going to wait for her forever. She needs to know that she has a chance with you once, or you're moving one. Which I think would be a wise thing to do in this situation.