Sky, I think maybe the issue is what you define as wrong. For example, during the depths of my depression, I neglected my friends and family, which caused them pain. To cause another person pain is wrong. Now one way to look at it is, this was due to the illness, so it should not be looked at as a wrong committed. The other way to look at it is, it was wrong, but because it was done as a result of the illness, then I should forgive myself for it. Which interpretation really helps the most probably depends on the person.

Another possibility is that the wrongs we need to forgive ourselves for are those that we have done to ourselves. Many of us turn our feelings in, and either actively or passively harm ourselves. I know in my case, I need to forgive myself for the damage I have done to my own body.

Those are a couple of things off the top of my head.