You must repent and ask God for forgiveness.

Admit and confess your sins to God.
"He who conceals his sins does not prosper, but whoever confesses and renounces them finds mercy" (Proverbs 28:13).

Repentance means:
• To acknowledge your sins.
• To be sorry for your sins.
• To confess your sins.
• To be willing to forsake your sins.
• To have your life changed by Christ.

Forgiveness is promised.
"If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness" (1 John 1:9).