I know exactly how you feel and have been there. It's important to adjust your thinking from "I need to break out of it and I keep failing" to celebrating the individual moments you succeed. One day at a time, as it were. Don't think "I need to start exercising regularly" just do something, go for a walk, lift weights, etc. Don't worry if you are going to do it tomorrow or the next day. You did it today. Good habits aren't things that "start" they occur because you just did something today, and you happened to do it the next, etc. until you just do it because it's a habit now.

I know it's hard, and I have to remind myself of the same things all the time. But I'm successful when I get out of my head and start acting.