Sometimes it's best just to let things go. It happened in the past and you can't change the past. Better to live in the present and focus on what you can do now to feel better. Yeah it happened and it sucked but they don't have time machines yet.

Gotta just accept things sometimes. You've accomplished stuff in life despite that happening, so don't discredit the good things based on the bad things. Keep pushing forward and trying to get to a better point in life.