Romans 10

10: For with the heart man believe unto righteoness; and with the mouth confession is made unto salvation.

11: For the scripture saith, whosoever believeth on Him shall not be ashamed.

Turning your life around begins with believing in faith that God exists.  Believing that He sent His son Jesus to die on the cross for you.  Confessing this faith out loud and confessing that you have sinned.  Asking God to forgive you of your sins, come into your heart and be Lord of your life.

When you do this, He will forgive you and there will be no shame.  You will be a new creation in Christ.  The old you will be gone and a new chance at a Godly life will begin.