The mere fact that You feel unworthy is a good sign. In a way Your letting go of a little pride. We all have it in different amounts but we ALL fall short and are undeserving. Your going to be OK. Keep confessing Your sins and praying and have faith. Jesus is the only perfect person without sin to be human. There's more hope for You and me than You can imagine. Ask for faith and keep asking. Keep it simple.
Here's a simple prayer, Dear God I know I'm a sinner, I know I am not where I want to be, and I want your forgiveness! I believe that Jesus died on the cross to pay the price for my sins. Please wash me clean from all sin, shame, and guilt, come into my life Jesus to be my Lord and Savior. I ask this in your name Jesus Amen!