What should I do, help?

I don't think your bipolar, but I think you might have anger management problems, which could be resulted from stress or maybe family problems? I don't know what has happened to you, and I don't want to force you to tell me, but it sounds like if you could find an outlet for your stress/anger, you wouldn't be facing these problems with the girl you like. There are many ways to release stress, like screaming into a pillow. or when she says something that bugs you, you can excuse yourself to the bathroom and scream into a towel. I think when she notices you're really trying to do better, she will want to hang out with you more.