The curse of nostalgia and the blessing of fading memory

I tend to swim in very deep nostalgia from time to time. For some reason, I tend to remember the most horrible things I have commited in the past way too vividly. And that makes me want to go and hide from the people who I have commited those atrocities to. But then, sometimes when I "accidentally" connect with them on social media after all these years, they dont seem to hold a grudge.. or maybe they do, and they are doing an awesome job of covering it.

This made me wonder, how many things and how many people do I genuinely wish, would forget my existence. When i started filling out that list, the list of incidents grew uncomfortably large. What a horrible human being I am. For some people in the list, the only thing i remember about the relevant person is the atrocities i committed and sometimes not even their face.

I sometimes notice posts in social media, about people getting forgotten in the constant influx of history and asking us not to worry about that. But with this thought experiment, I would dare say that getting forgotten is a wonderful gift to life in Earth. Imagine how bad would it be, if everyone remembers all the horrible things the other person has done on them. It would truly be a bloodbath. 

Moral of the story, dont connect with old school friends you have forgotten. You might remember stuff about them. ( just kidding. Connect with each and every one )

All of this makes me wonder, Is this common ? Or is it peculiarity that I am blessed with !?