Every sin can be forgiven. Christ is the lover of mankind, the Saviour of mankind, who loves us each of us more than we can imagine.
You should not only ask for prayers but pray yourself. Repeat the Lord's Prayer often to yourself, talk to God, make the sign of the Cross often, upon rising and before rest. When you feel pain, and don't want to do anything, repeat "Thy will be done, Father!". Even addressing a thought to God is considered a prayer.
As Christ forgives and all everything, we must forgive all and everyone. Forgive your father his sins, pray for his soul. Ask for forgiveness and forgive, that is Christ's message. Revenge against your father will only worsen your lot.
Return to the church, participate in the sacramental life of the Church, accept Anointing and Confession. Also do not be afraid to go to a psychologist or therapist. They are there to help.
May God keep you safe and strong, and may the Mother of God, the ever-Virgin, Mary keep you under her tutelage. Amen