The overthinking is over

I have this unhealthy habit of overthinking everything that I mess up. Even some little mistake that people don’t remember I dwell on too much. And I can’t help it either; I’ve tried letting things go and I still struggle with it. It wears me out and breaks my concentration. So one thing I am doing that I think will help is to write down everything good I have done. Anywhere from holding a door for a stranger or trying my best on assignments. Anything I do that would make me what I consider to be a good person. Everyday I write down something good I did. Then, when all the dark thoughts cloud all of the good qualities I have, I can look back and remember everything I did well and let go of those tiny mistakes.