Starting to self-isolate to reduce harm to other people

I've been discovering that I'm a harmful person. I seem to hurt everyone I get close to, and even sometimes those who I've just met.
My plan is to start pulling out of current meaningful relationships, and to not create any new ones. Any interactions with people will be on the surface level only, and will be well guarded to make sure that I'm not doing or saying anything that is likely to cause harm.

This isn't about me feeling sorry for myself.
It's about no longer being willing to destroy other people's happiness and well being so that I can learn to be a better person. The price for my education has become too high.
I'm so tired of hurting people.

I'm not sure where my ineptitude is coming from.
I guess I could blame my childhood (which was difficult and abusive, where proper social interaction wasn't taught, and was even discouraged).
I guess I could blame my long marriage (also difficult and abusive, with no growth to better behavior).
But it's strange that 5 decades of life and experience haven't given me the tools and knowledge I need to be a person who adds value to people's lives rather than taking it away.

No, I think that there are a few characteristics of my personality that I just need to somehow reduce to nothing; the characteristics that seem to be the source of my difficulty. Then maybe I can come back into society and be a real human being who interacts in a meaningful and beneficial and unharmful way with other human beings.

It'll be an interesting experiment. 🙂