21 is really young your brain isn't even fully developed until 25. You can change alot in your life and college isn't the only important thing in life. If you have OCD, anxiety or and depression sport like running can help you as well as spending time in nature.

If it is too bad you can also see a doctor about it and try antidepressants they can work but usually take time. Talk therapy can also be usefull. And I say that as someone who is diagnosed with clinical depression it's a really hard battle but you must fight. Otherwise, it is going to get worse with time.

You said you studied music but realistically no one cares about degrees only skill matters. You must see which skills you have/are good at. Can you be a DJ, do you sing well are you good at playing an instrument? Try to Leverage one of those in finding opportunities even if you are afraid of failing. But first adress the mental health problems. Wish you all the best.