“So now there is no condemnation for those who belong to Christ Jesus.” Romans 8:1

It is very important to let go of your past sins. If you have faith that Jesus died on the cross for your sins, you don’t need to feel guilty. After you go to God and confess, or agree, that you have done wrong the Bible says God forgives you and cleanses you from all unrighteousness. Here’s why you should let go of past sins.
Jesus Offered Himself as a Sacrifice

What is the most important reason to release the guilt of your past sins? Because “our High Priest (Jesus) offered Himself to God as a single sacrifice for sins” (Hebrews 10:12). Sin leads to death. Because of that, Jesus died the death that we deserved. Now, we’re able to live without guilt and we can be completely cleansed of our sin. Jesus has offered to remove your guilt, and when you receive God’s forgiveness, you can let go of the guilt. If you hold on to the very sins that God says he no longer counts against you, you are saying that you don’t trust or believe in His promises.
God Forgives All Sin

1 John 1:9 says “If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness.” Many people think their sins are too terrible for God to forgive. But the Bible says we can be cleansed of all unrighteousness. God even said, “Though your sins are like scarlet, I will make them as white as snow. Though they are red like crimson, I will make them as white as wool” (Isaiah 1:18).
God Helps Us Turn Away From More Sin

When Jesus forgave people, He told them to “stop sinning” (John 5:14,8:11). When your past sin is forgiven, focus your attention on avoiding that sin again. Trust that God will help you avoid and turn away from the temptation for further sin.
God Delivered Us From the Power of Sin

Jesus has not only paid the price to save us from the penalty of sin, but through the Holy Spirit He delivers us from the power of sin. Paul instructed us: “So I say, let the Holy Spirit guide your lives. Then you won’t be doing what your sinful nature craves” (Galatians 5:16). God gave us His Holy Spirit because he knows that in our own power, we cannot live a life that glorifies Him.