Repent to G-d every day. Admit your sins and change your ways, as the Pasuk says "Modeh V'eozev Yerucham" - "He who admits and desists will be shown mercy".
In the holy books it says that the secret of confession is as follows: Every deed a person does creates a prosecuting angel. That angel goes up to heaven and prosecutes the one who did the sin that brought the angel into existence. However, when a person confesses to G-d and admits that he is ashamed of his deed, the angel he created loses it's power to prosecute the person and he is easily forgiven. However, this only works with repentance, i.e. if the person changes his ways. Otherwise, the angel will continue to prosecute even stronger than before and point out to G-d that the person who created him was lying when he confessed and said that he feels bad for his sins.