By all means, get out ASAP. While who knows if it will help your chances at all, I think it would definitely be a boost for your self-esteem and happiness. Living under those conditions is just an anchor at this point. You might have a better outlook that will be more apparent to your STBX.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt
