Every one has missed the mark or fallen short of the standard set by God. As a race we all fall short. If we claim to be without sin, we deceive ourselves and the truth is not in us. If you cannot meet God's standard with out help, you must seek His help. This begins with repentance.
True repentance is both a change of mind and a change of actions.
You decide not to do things your way, remember that was never good enough. Now you begin to do things God's way. It is a decision followed by action. Godly sorrow brings repentance that leads to salvation and leaves no regret, but worldly sorrow brings death. The Lord is not slow in keeping his promise, as some understand slowness.