It sounds like you’re still in high school, and your wild and super strong feelings are natural for that age. But you have to realize that you said things that really hurt her, you’ve revealed a side of yourself that she doesn’t like, and you NEED to give her room to heal. AND YOU need time to heal as well. In a month or two, you guys might feel well enough to try being friends again, but for now the worst thing you could do would be to keep pestering and begging her.

Consciously divert your thoughts from her anytime they wander there. You can control what you spend your time thinking about, and thus influence how long it takes you to heal. Good luck.