Nobody should be ashamed of the history of their people. That encourages some to hide from it. Instead one should not shy away, but try to study and learn from the mistakes of their forebears, so their children might get a better world someday.
Shame for something you yourself have not done, though? Pointless.
To add to what someone else said, try to get some exercise. It can be free, and your brain needs some endorphins in there to help counteract all that pain. It won’t be a solution or anything, but it can help a little with the symptoms. Jogging, a pushup/situp regimen, whatever works for you. Can kinda give you a physical outlet for some of the pain sometimes.
Good luck.