Okay, this is really simple. You screwed up, and triggered either insecurity or anger, and now you got to pay. You have two basic choices, dump her and start again with another woman, or wait it out.
If she really does like you eventually her lust will take over, and those issues will go away. Most men (especially 19yo men) don't realize is that women are just as horny (well maybe not just as, but close) as men, they just have better control of it. Trust me, just calm down and stop trying to get her to kiss you, and her urges will bring her around fast enough.
You see, each time you try to kiss her you are reinforcing her will to resist, she knows you want her and by playing hard to get she is getting exactly what she wants, attention. Stop acting like you need her and all of a sudden she is insecure about her position in her life. She will respond by trying to reinforce her position as your girlfriend, with the result of you getting all you can handle.