You can start with Prayer,and a Plan...
The Problem :
"However, in today’s secularist cultural climate of indifference to sin, the natural law, and disregard for the truth and full meaning of human life, people often disregard the essential importance of repentance. This problem is connected to an abuse of human freedom which sees the use of free will as an absolute, something the individual can often wield without proper restraint and without reference to God or the moral law. This abuse has brought on the “culture of death” and has resulted in a calloused view of sin and our dependency on God."
The Solution :
From "The Catechism
Interior repentance is a radical reorientation of our whole life, a return, a conversion to God with all our heart, an end of sin, a turning away from evil, with repugnance toward the evil actions we have committed. At the same time it entails the desire and resolution to change one's life, with hope in God's mercy and trust in the help of his grace. "