I know it's a grating saying, but the journey of a thousand miles begins with a single step. It's true.
You don't have to succeed, you don't have to enjoy it, it won't be easy, but you do have to keep trying. Try to do whatever single action you can get yourself to do in the given moment that gets you closer to your goal. Then do it again. And again. Again. Etc etc etc. You'll at least be closer, and that's something.