Yeah, I have a similar problem, only I quit school when I started failing. Now I'm at home, and I don't know if I want to go back to school or try something else, and I'm not ready to be off working on my own. If I do go back to school, I'm not sure what I would study with sufficient interest to not get crappy grades at it.

It's hard when you don't know what you want to do. You can't apply effort on thin air.