Penitent

Definition: having regret of offense or sin and willingness to atone; contrite

Comment: If you did something you know was wrong, you will eventually see it for what it was, and want to reverse the injury. To feel a need to take positive action is a first step. Yet you may not be able to remove the harm done to a specific person. What you can do is change who you are. Then you will act differently to all.