I am a very composed self disciplined young man with a great future. However there was a period of my life where I was a mental wreck who did drugs, posted offensive things on the internet, hung out with bad people, and made poor choices. Tbh I have a bit of PTSD from these times. I literally will stop and cringe when a memory of my idiocy comes up. I am proud of where I am but my mind creates allusions of things from the past coming back to bite me. What should I do to stop this thinking? -thanks.