All I think about is people who can do better than me

The only thing you are doing is reinforcing bad behavior. You need to replace how you think - with productive thoughts - so you can develop and grow from past mistakes. It's OK to be self critical, if you learn from it -- NOT if you continue a spiral of destructive thoughts and actions.

If you feel the need to release endorphins, with physical activity, do something productive - run, clean, mow the lawn, go to the gym etc.

Stop focusing on one talent and look at the whole person - you or anyone else. Of the more than 7 billion people on Earth, you are far more talented and capable than the majority of them and they would look up to you and see you as a success. There are things you can do better than anybody. You are ahead of the curve. Get professional counseling for you faulty thinking.

your habitual thoughts are mightily powerful! you’ll be able to tell everyone how right you were, if you don’t change your mind.

Maybe think about how you can be better yourself instead of attacking yourself..

Just a new thought that maybe never occurred to you yet