When facing spiritual warfare, one of Satan's tactics is to inflict you with shame.  He wants you to think something is wrong not just with what you did, but that something is wrong with you.  But Scripture tells us how to deal with shame and guilt.  We see how to be free from the failures of our lives and the emotional weight we carry with them.  Jesus gave his life to set us free and to live in His freedom.  It's time to be set free.