Hi Surrender62, welcome to CChat!
Sometimes it breaks my heart to think of the stupid and sinful things that I did when was not walking in the truth that I knew, and I'm so sorry for those things, too.....but.. once we've made things right with God, we're the ones who still think about that part, not God. God forgives us and welcomes us back into His loving embrace.
I think that a certain amount of remembering will help us not to make the same bad choices again, but, at the same time there is sometimes a fine line between remembering and kicking ourselves over it and living in our regret. I do it too so that isn't meant as a sermon. Rather a gentle reminder (meant to be encouraging to you) that once we are forgiven and set free from our failings, we are free indeed. (John 8:36) Now we can rejoice in His freedom, and His forgiveness, and His great love together-- as well as make some new friends and enjoy some good fellowship.
Again, welcome!