Judgment on Christ brought forgiveness to us. That's what the cross is all about. You make your life much harder than necessary if you think God is requiring you to confess your sins and you are kidding yourself if you think you can even remotely confess all of your sins. We sin in ways we have no idea. Sin is a hopeless case. That's why we needed Jesus to take away our sins and the sin of the whole world (1 John 2:2).
Once you've received Christ you are the righteousness of God in Christ which is a gift. Just as you were a sinner before because of Adam regardless of how much righteousness you did, so now you are righteous because of Christ no matter how much you sin. Otherwise the work of Adam is greater than the work of Jesus Christ the Son of God.
Jesus was condemned and judged for all your sins 2000 years ago. It is done. "It is finished." In the New Covenant, God says, "I remember your sins and iniquities no more." It is done. "It is finished."
Don't add to God's finished work by demanding "repentance and confession." That is a work to gain righteousness but our righteousness never was, is not now, nor never will be a result of our works. Our righteousness is a gift that comes from Jesus' perfect sacrifice and finished work on the cross.
THAT is the gospel of the grace of Christ.
Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage. Behold, I Paul say unto you, that if you be circumcised, Christ shall profit you nothing. For I testify again to every man that is circumcised, that he is a debtor to do the whole law. Christ is become of no effect unto you, whosoever of you are justified by the law; you are fallen from grace.
Galatians 5:1-4.
1st Jn 1:5-10
(5) This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
(6) If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth:
(7) But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
(8) If we say that we have no sin, we deceive ourselves, and the truth is not in us.
(9) If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
(10) If we say that we have not sinned, we make him a liar, and his word is not in us. The Gospel is that salvation from condemnation is possible by believing through faith in Christ. This means what Christ provided on the Cross. By believing He was judged for all sin, and now placing all known and unknown sins before God the Father through faith in what Christ provided on the Cross in the judgment of those sins, God the Father is sure and just to forgive those sins.
One cannot approach God through faith in ourselves, but only through faith in Christ and His sacrificial atonement for all sin of all humanity.