What income does your family have? Do you have a way to set aside money for yourself? It's possible to set up bank accounts completely on line. Whose name(s) is the car in?
If he's trapped you there by hiding the car keys, he's likely alienated you from those who might help you. But don't assume they wanted to accept that, or that no one would drive out to pick you up. Complete strangers on the internet here care what happens to you. People who know you will, too.
Each Al-Anon group has its own spirit, and many are on line. It's worth trying different ones.
Sorry you're going through this. The biggest benefit from something like Al Anon is knowing you're not in a unique situation, that there isn't something you need to do to fix someone who isn't ready to be fixed. If you're already comfortable with emotionally removing yourself from the rescuer role, it would be less helpful.
@AlphaCentauri I'm not trying to fix him. That's his job. And I'm very aware that I'm not exclusive to this predicament. I'm trying to plan my way out of this for me.