I saw a lot of myself in your post. I too feel like I want to drive away and never come back. Mostly I just want to drive until I no longer feel anything. I feel like I'm a burden. I'm also not looking forward to college. I just can't find anything I'm interested in doing, but I think theres a lot of people who feel that way.
I also get the feeling when I'm numb. I convince myself I just don't care because its easier, but I know that I do. I do care, I want to get better, and I want to have hope for my future. Sometimes it just seems that I just can't though. So I'll think if I tell myself enough times that I don't care, maybe I won't.
I don't know if any of that is how you feel but I just wanted to let you know you're not alone.