Forgiveness is a gift to yourself. You cannot forgive others, that would be crossing over into their dominion and interfering with their free will. You can only control yourself. We spend so much time beating our self up for being all kinds of things...too stupid, too fat, too ugly, too angry, etc... Forgive yourself! Be gentle and kind to yourself! Forgive your anger, your jealousy, your whatever. Let it go and fill yourself with forgiveness for your short comings. Try to do better, learn from your mistakes and move on...don't dwell on them.
Your happiness is in your own hands, accept it and give yourself the greatest gift possible!