I am a religious person, a Christian, and I do not see any directive in scripture for forgiving oneself. Thus, I say it does not exist. What do you say?
I refer you to Mark 12:31 in the New Testament: “Love your neighbor as you love yourself.” We are urged there to apply the moral virtue of love to ourselves. What is self-forgiveness? It is applying the moral virtue of love toward the self when you have broken your own standards.
For additional information, see Faith and Religion.