To repent is: to have a sincere realization of wrongdoing, to return to God and confess your sins just like the prodigal son.
First we see an inner change of the prodigal son's way of thinking (Luke 15:17). He came to repentance. Only then he decided to return to his father and confess his sins (Luke 15:18-20a). When the son was on his way home, his father was already running towards him, moved with inner compassion (Luke 15:20). The son confessed his sins (Luke 15:21). The father forgave all of his son’s wrongdoings and gladly restored him to his position as his son (Luke 15:21-24).
You can come to God the same way and confess your sins. God's love for us is so great that He gave His only Son for us, because He does not want anyone to perish (2 Peter 3:9). He wants to be merciful to you and forgive your sins. There will be joy in heaven when you repent of your sins (Luke 15:7,10).