Where's the "UNDO" button?

Walking through life and all of a sudden your hit with a hurdle and you think sure I can jump this.  Then suddenly you feel as if there is a domino effect occurring and you have no control.  I get that feeling and all I can think of is hit the UNDO button.  In the computer world it is sometimes that easy.  Real life is not so easy.   Once it is done it cannot be undone.

In some ways that is good because Jesus Christ died once for ALL.  This cannot be undone.  Thank you, God.

But as an individual, I make mistakes that I want to erase.  I know with the blood of Jesus Christ I can erase the sin through forgiveness.   Yet I encounter another hurdle.....do I forgive myself?

Is this line of thinking acceptable?   If I cannot forgive myself then am I forgiven by Jesus and God?

What does the Bible say?

Matthew 6:14,15

For if ye forgive men their trespasses, your heavenly Father will also forgive you:  But if ye forgive not men their trespasses, neither will your Father forgive your trespasses. 

Matthew 18: 21-35

Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seventimes?  Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.  Therefore is the kingdom of heaven likened unto a certain king, which would take account of his servants.  And when he had begun to reckon, one was brought unto him, which owed him ten thousand talents. But forasmuch as he had not to pay, his lord commanded him to be sold, and his wife, and children, and allthat he had, and payment to be made. The servant therefore fell down, and worshipped him, saying, Lord, have patience with me, and I will pay theeall.  Then the lord of that servant was moved with compassion, and loosed him, and forgave him the debt.  But the same servant went out, and found one of his fellowservants, which owed him an hundred pence: andhe laid hands on him, and took him by the throat, saying, Pay me that thou owest.  And his fellowservant fell down at his feet, and besought him, saying, Have patience with me, and I will paythee all.  And he would not: but went and cast him into prison, till he should pay the debt. So when his fellowservants saw what was done, they were very sorry, and came and told unto their lord all that was done.  Then his lord, after that he had called him, said unto him, O thou wicked servant, I forgave thee all that debt,because thou desiredst me:  Shouldest not thou also have had compassion on thy fellowservant, even as I had pity on thee? And his lord was wroth, and delivered him to the tormentors, till he should pay all that was due unto him.  So likewise shall my heavenly Father do also unto you, if ye from your hearts forgive not every one hisbrother their trespasses.