Hi Patk! I can understand having guilt over past behavior. I've done my own long list of things I am ashamed of. I'm only 4 months sober and going through the steps by myself and trying to figure this stuff out.
Given that, the only thing I could say is....you have no control over those things now. Right now I think you should just leave those things in the past and realize that you can't change them.
Going through the steps could help you discover some of the reasons you did the things you are feeling guilty about. There are some great questions in the step study section that helps one to attempt to figure these things out and come to terms with them. I highly recommend them!