I'm New-ish here, but... I hope your heart is right with the Lord, but in case it isn't and you wish it to be:

Father I pray for forgiveness for the sin in my life. I do not want to be eternally separated from you. I pray that you forgive me and accept me as a child of yours through Christ's sacrifice in my stead. Thank you for being a good, loving father and I accept Jesus Christ into my heart. Thank you for your grace and mercy. Amen