Repentance means total submission to God. Scripturally, the phrase “broken heart and contrite spirit” is used to describe total submission to God.
The Lord explained that this state is defined by complete obedience to him:
Verily I say unto you, all among them who know their hearts are honest, and are broken, and their spirits contrite, and are willing to observe their covenants by sacrifice—yea, every sacrifice which I, the Lord, shall command—they are accepted of me. (D&C 97:8)
A broken heart and contrite spirit is no light thing. It requires total submission, in all things, at all times, and in all places. You really have to fear God more than anything else, and you really have to love God more than anything else.