Let's say a basic capacity of the human mind is to find fault with itself. A squirrel does not awaken in the morning and wonder how to be a better squirrel, or more of a squirrel, because all squirrels are basically perfect squirrels already. So to explain this anomalous fact about humans, we have a myth like "original sin." (Well, there is a myth, first, and then its interpretation.) But we can see that the purpose of the myth is to explain why there is something wrong with us, but the real feature we need to explain is not why there something wrong, but why we think there is in the first place. Why do we have a capacity to find fault with ourselves? The oak tree presumably lacks that feature.
Another approach would be to unlearn the habit of fault finding, or to reduce it to its most banal dimension, where any observation of the self would be free from shame and guilt. Self-acceptance feels utterly foreign to me, because I am attached to certain negative ideas. These ideas are, even, a source of reassurance. To renounce them would be to accept defeat.