I have lost so many in my life. But have only managed to confess to 2 people I've currently hurt. I'm now doing DBT and it helps but... I cant help and think that Im a bad person for having so many failed friendships and relations, and for never trying to understand their side. Back then I believed for everyone to be toxic... but it was me that was the abuser. It's me thats the bad person... 

Im wondering if I apologise to the old friends of mine from high school, will I feel less of a bad person? Will I finally forgive myself? I just require them to forgive me. Whether we become friends or not is upon them, I do not wish to control them. I simply wish to be forgiven and taken as a good person.

I need advice: do I apologise to them? Or move on and work on myself through DBT?