Sometimes other people hurt us so badly, and the wounds run so deep that forgiveness has to be a process rather than an event - it's not something that can be dealt with in one go.
From your opening post, it seems that you want to be able to forgive, but find that you don't have the strength.
Some suggestions from my experience - I hope they are helpful to you in some way
- + Be completely honest and open about the situation before God. Tell him the whole extent of the pain and hurt you are carrying. Don't spare any details.
- + Refuse to be owned by the bad things that have happened. When memories of how you've been wronged return, remind yourself that you are committed to living in God's grace and a spirit of forgiveness rather than dwelling in the things that have damaged you
- + Ask God to transform your mind and to give you the grace to forgive. If the burden is too great, ask him to shoulder it for you
- + Talk to trusted Christians and ask them to help you pray for forgiveness
- + Be patient and kind to yourself
- + Know that grace is always costly. And priceless
- + Remember the man who said to Jesus: "Lord, I believe! help my unbelief". How about "Lord, I forgive! Help my unforgiveness"?
- + Don't expect freedom from your burdens to come all at once.
Know that if you hold on to unforgiveness, it will eventually consume you. Better to pass all that to the love and grace of God. It is possible to pray for God to bless a person who has hurt you, even if it is an act of will and obedience rather than a spontaneous thing.