Samael_Khan
Goosebender
I could have seen myself writing something very similar.
Fairly early on I found that the only reason I ever felt "down" was when other people around me were behaving certain negative ways, otherwise, I was always completely fine either on my own or around people who weren't being negative. "Content" is a good word for it. Ultimately, I even stopped letting much of what other people feel affect my mood, even when I am around them. Someone can be a complete sour-puss, or intent on complaining about everything, and I'll just stay even-keel, because I came to understand about myself that other people could affect me negatively, and I didn't like it... so I shut it off. It is interesting being able to control a thing, that would otherwise probably be involuntary, because you understand why it is happening.
I am glad to know that someone else can relate, because for a period I was around people who were trying to get me to socialise often and I was feeling like something was wrong with me which made me feel depressed. After coming to terms with it I am feeling like my best self.
Like you I was around people who had negative ways and avoiding them was for the best. But whereas you shut it off, I am largely oblivious to it besides when I start picking up their traits and have to do some self reflection. It just goes to show that knowledge of ourselves is a very powerful thing and can change our lives.
Maybe the motto should be "Know thyself".