The Bible tells us much about forgiveness, about forgiving each other, being forgiven by God but never about forgiving ourselves.
And forgive us our debts, as we forgive our debtors. | Matthew 6:12
And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more. | Jeremiah 31:34
And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses. | Mark 11:25
And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ’s sake hath forgiven you. | Ephesians 4:32
As far as the east is from the west, so far does he remove our transgressions from us. | Psalm 103:12
And be kind to one another, tender-hearted, forgiving each other, just as God in Christ also has forgiven you. | Eph. 4:32
But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth. | Colossians 3:8
By this we shall know that we are of the truth and reassure our heart before him; for whenever our heart condemns us, God is greater than our heart, and he knows everything. | 1 John 3:19-20
Be kind to one another, tenderhearted, forgiving one another, as God in Christ forgave you. | Ephesians 4:32
Bearing with one another, and forgiving each other, whoever has a complaint against anyone; just as the Lord forgave you, so also should you. | Colossians 3:13
Casting all your care upon him; for he careth for you. | 1 Peter 5:7
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. | John 3:16
For you were called to freedom, brothers. Only do not use your freedom as an opportunity for the flesh, but through love serve one another. | Galatians 5:13
Hatred stirs up strife, but love covers all offenses. | Proverbs 10:12
If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness. | 1 John 1:9
In him we have redemption through his blood, the forgiveness of our trespasses, according to the riches of his grace. | Ephesians 1:7
Judge not, and you will not be judged; condemn not, and you will not be condemned; forgive, and you will be forgiven. | Luke 6:37
Let all bitterness and wrath and anger and clamor and slander be put away from you, along with all malice. | Ephesians 4:31
Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother. | Matthew 18:15
Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord. | Acts 3:19
The discretion of a man deferreth his anger; and [it is] his glory to pass over a transgression. | Proverbs 19:11
Therefore being justified by faith, we have peace with God through our Lord Jesus Christ. | Romans 5:1
Then said Jesus, Father, forgive them; for they know not what they do. And they parted his raiment, and cast lots. | Luke 23:34
To seek forgiveness from yourself would be to ask yourself to forgive you for what you’ve done against yourself. But this doesn’t make any sense. We are not the ones who make moral laws that we can break. Rather, God does that, so forgiving yourself just doesn’t make sense.