What can I do about my life?

I'm at my wits end. My mom left, and I live with my dad. I'm 18, and I learned how to drive, but he never took me out to get a license. I don't have a job, even though I sent in a lot of applications. He keeps telling me that it's time to move on, and I've got to do my thing, and he's going to do his thing. He says as soon as he's helped me on my way, he's leaving, and no one will ever know where he is. I really want to be a writer, but he flat out said it's not going to happen, and that my only two options are cheap college, or the service. I can't go to the service, I'm anorexic so I wouldn't p physical and I'm a pacifist, and if I pick college, he'd stay around longer, which I don't want, because I really want to be on my own. Is there any helpful friendly advice I can get?