Romans 4:5

To him who does not work but believes on Him who justifies the ungodly, his faith is accounted for righteousness.

God doesn’t expect us to work for our righteousness. What He expects us to do is believe in Jesus and be saved. Our faith and belief in the word of God does the work for us, so we no longer have to feel guilty for past sins. Guilt doesn’t bring faith, and doubt never moved a mountain. Righteousness clears the past and allows God to move in our lives.