Although all humans are sinners before the eyes of God (Romans 3:23), he has, in love, given his only Son in order to reconcile us to him. We have all lost our lives to Satan and believed his subtle lies, which is why Jesus had to come and literally buy us back or redeem us from him (Galatians 3:13).
The only difference between sinners on planet earth is that those who believe in God and have become true Christians are in a state of grace and forgiveness. The sacrifice of Christ, when it is fully accepted by a person, makes them a son or daughter of the Eternal.
God does not limit himself concerning how much disobedience he will forgive if someone is willing to repent. In fact, Jesus, who loved Peter, stated that we should forgive others as many times as is needed!
Then Peter came to Him and said, "Lord, how often shall my brother sin against me and I forgive him? Until seven times?" Jesus said to him, "I do not say to you until seven times, but until seventy times seven." (Matthew 18:21 - 22, HBFV throughout).
Forgiveness For All!
In Matthew 12 Jesus taught that every sin and blasphemy will be forgiven by God (Matthew 12:31 - 32). The only exception he made is when a person willfully wishes to be a sinner. This type of disobedience in not forgiven because a person willfully (and not out of weakness or deception which we can all fall prey to) refuses to respond to his love and repent!
Our heavenly Father wants to save everyone (1Timothy 2:4) and therefore is quick to forgive sinners. The only question is how much pain we are willing to go through before we decide to believe him and not the devil. In Hebrews 12 Paul says God, as a loving Father, corrects every person He works with and considers one of his spiritual children.
And you have already forgotten the admonition that He addresses to you as to sons: "My son, do not despise the chastening of the Lord, nor grow weary of being reproved by Him;
"For whom the Lord loves He chastens, and He severely disciplines every son whom He receives." (Hebrews 12:5 - 6).
Satan's will is to have you think how bad you are and to believe the Eternal does not love you. No matter how much a sinner you are God always loves you and will allow you to go through as much suffering as necessary so that you finally believe Him and not His adversary. He wants us to repent (Acts 2:38), which means to change our mind from seeking the will of the devil (e.g. which is to NOT forgive yourself after you have been forgiven) to His will.
What God Wants
Jesus, in his Sermon on the Mount, states that if we ask the Father for something (according to His perfect love and will) he will give it to us (Matthew 7:7 - 8). It is the Father's will that we ask for forgiveness. Although He knows we are weak and sometimes give in to the temptations and deceptions of sin, He promises to always forgive is we ask. He also promises to remove, ultimately, all traces of rebellion within us.
If we confess our own sins, He is faithful and righteous, to forgive us our sins, and to cleanse us from all unrighteousness. (1John 1:9).
When you pray, ask Him to help you believe Him and accept His forgiveness, as well as his boundless love, no matter how bad a sinner you think you are. Belief (faith) in God can lead anyone to true repentance and reconciliation.