In order for deliverance to be successful, there can be no unforgiveness in your life. (Read Matthew 18:21-35)
Like in the scriptural example above, forgiveness in not a feeling, it is a choice. If you need more understanding I suggest reading Forgiveness by Rodney Hogue.
When you are ready to forgive, I suggest praying something like this for each person that the Holy Spirit brings to mind.
"Father I choose to forgive ______ for the pain they have caused me. I choose to turn away from the actions they commited against me and look to Jesus and His sacrifice on the cross instead. I take my hands and right for revenge & human justice off of ______, and give him/her into Your hands for Your perfect judgement, and redemption in love instead. Save and bless them Father, just as you have saved and blessed me in your grace and mercy. In Jesus holy name, Amen."
If you feel that you are unable to forgive and need help with this step, consider starting with my one x one Discipleship ministry first and I can help you through this process.