When I was probably 8 - 10 years old, I helped sell donuts after church for my parish. While I was selling them, I would slip change into my shoes, so really I was stealing from the church. How sad is that!
This bothered me immensely all of my life. When I was in my 30's, I mailed my letter of confession to my old parish, along with $100.00. The current priest sent me the nicest letter, letting me know the $100.00 was not necessary, and he was sure God had forgiven me.
Sometimes it's hard for us to forgive ourselves, even if others have forgiven us.