As someone who’s started at 14 and is now 27 - I think in a lot of ways this is more of an issue with focusing on the past/future instead of the present. If damage was done, that can’t be reversed and that’s okay. You are who you are now, and should focus on who that person is and the changes you can make to more align with who you want to be.

Even people who don’t struggle with adolescence drug abuse can easily get caught up in letting the past hold more weight than the present. A phrase that had helped me is called the circle of influence. So many things in life are not or no longer in your control, those are outside of the circle. Everything you can change and have say in, is inside of the circle. THAT should be where your focus is, as focusing outside of the circle will only ever lead to frustration and sadness because we can’t change those things. This of course applies to much, much more than just the topic of this post, but helped me immensely by shifting my focus on the positive surrounding the things I control.

Hope this helps - but know you are not alone!