It's simple chemistry
What is that law... in chemistry, I distinctly recall learning it from old Doc and Mr. Wells (I wonder if they're still alive and "together")... it takes more energy to get a reaction happening than it does to keep it going? Same law in physics, I think.... More force to move an object from stationary than to keep it moving? Google it. I'm living proof. I don't want something. Whatever it is; medical school, a boyfriend, an orange. Then somehow I consider that it might not be so bad. And then, I invariably change my mind. And then, once over the hump, once the reaction starts, no one can stop me. Impatience, a low energy force, takes over.