Be assured, you will sin again. All of us do. As long as we are in this world we are in a fallen state and from time to time our natural inclinations will take over and we will sin. Jesus knew this. Romans 3:23 tells us that “All have sinned and fall short of the glory of God.” When His disciples asked him, “How many times can my brother sin against me and I forgive him? Up to seven times in a day?” And Jesus said, “I tell you, up to seven times seventy" (meaning, on and on).
God will certainly forgive no less than He instructs His disciples to. John tells us that “If we say we have no sin, we deceive ourselves and the truth is not in us.” (1 John 1:8) But then he also says, “If we confess our sins, God is faithful and just to forgive us of our sins and cleanse us of all unrighteousness.” (1 John 1:9) This is not an excuse to sin, but an acknowledgement of the fact that we all fail. So, each day we should confess to God in prayer that we know we have sinned, even if we can’t remember all of them. He has promised to forgive us always, over and over.
However, it is important that we grow in our Christian faith through Bible study, prayer and fellowship so that God can begin to change us for the better. In doing this, we begin to find our purpose in life and find the joy and happiness that can only come from knowing what God has created you for and following Him.