Let me add something, if you confess that JEsus is Lord. That means you believe that he is God and he died for our sins. He is Lord of your life too.
Let me add another point. Now this is sorta debatable, but it is what I believe:
While we will sin, if we continue to rebel against God and turn away from Him, this will grieve the Holy Spirit. EDIT --> Which the Bible says is an unforgiveable sin. <--- EDIT SEE BELOW.
So we should continually pray for forgiveness and try and stay true to the Lord.