Repentance is turning away from your way of doing things. It is confessing that you need Jesus to make a change in your life. You can repent by asking God to change your heart. Tell Him about the areas of life you struggle in. Talk to God about your desires and your story. He wants to hear from you.
Repentance is not a one-time act, but a lifelong process. Every time a harmful thought enters your mind, or you act outside of God’s principles, repent and turn it over to God. Each time you feel angry or distressed, look to God. He is our Father, and He wants to help.