Forgiveness is turning to God for support and guidance, and asking God to take on the anger you might still feel. Forgiveness takes a long time, possibly decades. Forgiveness is remembering the other person is human, with faults, and possibly made you angry when they themselves hadn't dealt with their own internal anger. I'm not saying forgiveness isn't painful. I speak from experience.
Forgiveness is tough.
The results, though, free you to experience and enjoy life. I felt anger from having survived a horrible divorce of my parents when I was five. I experienced abuse of several kinds, as well as neglect. Home wasn't safe. Home was violent and abusive.