Grudges

Grudges take up brain capacity and prevent us from performing at our very best.
 What we focus our minds upon grows; this is true of anger, resentment and hatred too.
Therefore, it is very difficult to truly achieve great things for ourselves when we have a lot of our energetic capacity tied up in negativity.

All the years you have waited for them to "make it up to you" and all the energy you expended trying to make them change (or make them pay) kept the old wounds from healing and gave pain from the past free reign to shape and even damage your life.

And still they may not have changed.
Nothing you have done has made them change.
Indeed, they may never change.
 Inner peace is found by changing yourself, not the people who hurt you.
And you change yourself for yourself, for the joy, serenity, peace of mind, understanding, compassion, laughter, and bright future that you get.