One thing that is very healing is reconciling. It is about balancing the accounts in your emotional and spiritual logbooks. It can be as simple as writing letters.
Write that letter to the person who you can’t stand, who made you mad, who left you. Who owes you? Who has slighted you / hurt you / betrayed your trust? Write a letter to each one. Tell them how you feel. Recall the situations that were difficult.
If you feel like you can mail the letters, then do so. If that is too much, then just write them. It may be difficult to send them – the other person may not be able to receive your message. Just writing them is very healing.
One option if you can’t send the letters is to burn them. It is a way of releasing energy. Imagine the anger and frustration disappearing in the flames. See the smoke rising up as a prayer to God, asking for healing in that situation.
Then think about who do you owe? Who have you slighted / hurt / betrayed? Write that letter to the person who you never thanked, who was kind, who helped you more than you deserved. Send those letters. People need to hear that they have done a good job or made a difference.
Moving onward, think about reconciling with yourself.
Write a letter to yourself when you were 12. Forgive yourself, and offer yourself guidance.
Write a letter to who you will be 12 years from now. Encourage yourself, and cheer yourself on towards your goals.