If you feel safe, tell your abuser how you feel. Use the telephone. Write a letter. Let them know you appreciate your freedom. Tell them they don't control you anymore and make them understand the impact of this realization. If you don't feel safe, write a letter and don't send it. Saying it to yourself is also a form of empowerment.
Let it go
Realize that as long as you are tormented by the past, a bit of agony will linger. Don't let this happen. Accept what you've been through as a past occurrence, which you have surpassed and no longer must endure. Let it go. The object is to refuse to allow your abuser any control whatsoever on your life. If you dwell on it, you can't achieve true freedom. It's over. It's done. Your life is better. You are better.
Forgive
Don't harbor resentment toward those you feel should have stepped forward and saved you. Don't blame anyone except the person who directly harmed you. The more resentment you have, the harder it is to let go of the experience. Depending on who abused you, it may help to let go of as much hatred as you can manage. Don't excuse them. This doesn't mean you have to allow them a place in your life. It means you can push the past behind you and make life normal. It's comforting to believe this person will face judgment at some point in time, and it's not all up to you to enforce.
Enjoy happiness you've never thought possible
Take these steps and modify them to fit your goals. Any negative feelings harbored from your past experiences you can let go is weight from your shoulders. After all, you're the better person for it in the end. You win.