It's hard to do anything when we feel like the only choice is between everything and nothing. When you find yourself caught in "all or nothing” thinking, giving yourself only two opposite choices - either "this" or “that”, ask yourself if there might be other possibilities somewhere in between.
For example, maybe you don't have to choose between quitting your job or putting up with your boss being cruel to you. You might look for ways to stay and start to shift the situation with your boss. You don't have to decide everything right now. Just decide something.
What about the big decisions about where you want to go? Break your goals down into concrete steps, steps you can take, just little steps - walking on middle ground.