Ugh I'm sorry this sucks so badly.
However, it sounds like you've come to an important realization: you're done. In your mind, there's nothing worth saving. That sort of realization is priceless. Some people can go years without accepting the reality of their situation, to the detriment of their friends and family. It seems to me that you might be ready to do what it takes to extricate yourself out of this.
What's your next move?