Have you sinned? Do you continue to sin? Do you sin less than you used to sin? Some people truly cannot find fault within themselves, but not-because they do not have sin, but they have not submitted to the truth, for if they did, they would see their sin. John said,

If we say that we have no sin, we deceive ourselves, and the truth is not in us (1 John 1.8).

Get the truth in you that you might learn of your sin, and that you also might learn how to stay away from sin, how to be forgiven of your sin, and how to please God.