Learn to forgive and forget and keep no record of wrongs

I have always had a problem forgiving anyone that hurt me or did anything to rub me the wrong way. That is not something I am proud of. I know life would be so much easier if we would learn to forgive and not look for ways to strike out at the one who hurt us. What makes it so hard for me is that the people who hurt me the most were supposed to be my haven. How can I do that? How can I do that without reservation, accepting the past but not replaying it in my head? How can you look the people who hurt you in the eye while they are busy justifying it? Help!