Learn To Forgive Yourself.

Beloved of God, Jesus came into this world for you and I, to make us the sons of God.  Since man was originally condemned due to the first Adam's fall in the garden of Eden, the second Adam Jesus came to make us righteous by shedding His blood for the forgiveness of our sins.
Romans 5:17, "For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.)" 
It's important to note that one cannot reign in life if he/she is living in sin.  You need the to receive the abundant grace of God to walk away from sin.  Grace has been given, take advantage of it.  Ask God to forgive you, cleanse you from your sins and declare that you have received abundance of grace to overcome sin in Jesus name.
1 John 1:9, "If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness."

Beloved, when you ask God to forgive you, please believe that He has..it doesn't matter that satan may be plaguing your mind with guilt.  You must believe God's Word, forgiveness and also forgive yourself.  If you don't forgive yourself, you will feel like God is far away from you and you will loose faith..and that is exactly where the enemy wants you to be in the arena of fear, doubt and unbelief.  Don't make God a liar.  The blood of His Son Jesus Christ is more than able to wash and cleanse any sin in the world.  You can't receive God's forgiveness if you don't forgive yourself. Remember, Revelation 12:11, "And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death."