God knew just how resentful and unforgiving we can be towards ourselves because of the past mistakes we made.
So God sent us His Son to be crushed and punished on our behalf so that we can walk free from the ultimate judgement of God.
Jesus had exhausted all of God’s wrath so that today we can have God’s perfect accecptance and forgiveness. Therefore beloved if God is no longer angry at you, you no longer have to be angry at yourself.
If God has forgiven you, you can and should forgive yourself too.