Why do we do what we do? We live for God and love God because He loved us first. Jesus died on the cross for our sins. It seems rough sometimes, but what if you had to be punished everytime you sinned? What if someone stepped in and said "I'll take it", wouldn't that be amazing? That is what Jesus did. He lived a perfect, sin free life, and Said I will die for you. He lived perfect for us so that He could take our sin. That is why we do what we do.
God is not surprised by anything you do in life. He know's where you have been, and where you are going. You don't have to worry that you fell too far for Him to love you. He will love you and supports your right to any decision you make. You choose this day who you will serve, as for me and my house we will serve the Lord.