Sanctification comes through “yield[ing] to the enticings of the Holy Spirit.” (Mosiah 3:19) The Holy Ghost changes you, but not until after you forsake sin, and only through giving you more information.
After you forsake sin, God will begin teaching you new things through the Holy Ghost, and he will continue doing so as long as you remain reconciled to everything he teaches you:
Nevertheless they did fast and pray oft, and did wax stronger and stronger in their humility, and firmer and firmer in the faith of Christ, unto the filling their souls with joy and consolation, yea, even to the purifying and the sanctification of their hearts, which sanctification cometh because of their yielding their hearts unto God. (Helaman 3:35)
This process is called sanctification—a word derived from the Latin, sanctificare, which means “to make holy.” You become more holy with every increment of his knowledge that you obtain and reconcile your life to.
One does not become sanctified by the Holy Ghost without becoming without sin—both of commission, which comes prior to baptism, and of omission, which comes over time through revelation of greater breadth and depth of understanding.
The more information you have received and integrated, the more you will continue to receive. The more information you have received and integrated, the more like God you become.
As God teaches you more about the degree of joy available in him and about the disastrous outcomes of sin, you will grow to feel very different about many things than you do now. You will better understand the cost and value of what God offers and all alternatives. You will learn to be repulsed by sin because you will come to understand its cost and alternatives. You will experience much greater joy in greater receipt and awareness of God’s love. You will feel greater sorrow from a deeper understanding of the poor choices people make, how preventable they are, and how often they make them knowingly.
Now they, after being sanctified by the Holy Ghost, having their garments made white, being pure and spotless before God, could not look upon sin save it were with abhorrence; and there were many, exceedingly great many, who were made pure and entered into the rest of the Lord their God. (Alma 13:12)
...the Spirit of the Lord Omnipotent...has wrought a mighty change in us, or in our hearts, that we have no more disposition to do evil, but to do good continually. (Mosiah 5:2)
It is important to stress that, though the choice of accepting what God offers is yours, everything about being born again is only available because of what God does for you. Through the water of baptism, you stop sinning. Through the blood of Christ, you are forgiven of past sins. Through the spirit of God, you become more like God is through learning more about him and living what you know.
...on account of their exceeding faith and repentance, and their righteousness before God, they choosing to repent and work righteousness rather than to perish...they were... sanctified by the Holy Ghost, having their garments made white, being pure and spotless before God.... (Alma 13:10-12)