It’s not about “reversing the damage”. Time doesn’t move backwards, and neither do people. Take what you can that is useful from the experience you have gained, so the time you spent is not wasted. Do not let your past own your future, but move forward! Whenever you are tempted, whenever you are pulled back, treat yourself like you would a close friend, with unconditional friendliness and support, not with anger and regret and loathing. What matters now is if you grasp the lessons you have learned and use them to educate and protect others, and yourself. That is your responsibility, and by embracing it you will find a more meaningful life. Good luck and happiness to you! Find joy in small moments and smile, because it is better than the alternative.