I know what you mean op, if I am with others constantly, particularly those outside of my immediate family, I need a few quiet days to re-set.
There also seem to be quite a few people about unfortunately who haven't been taught the basic rules of human interaction when meeting socially, that is, the idea of conversing in turn, rather than directing a monologue at someone.
I don't think many people are good at listening nowadays either.
I am happiest when pottering about alone, although if I was truly isolated, without any family or friends, maybe I would view being alone differently?
I think it's natural, when you are young and have energy, to want to socialise with more people, to establish friends and create a family and then become involved in the wider community through work, school and extra-curricular activities etc. And it's natural in turn for that process to reverse as we age.
Having said that , without wishing to sound preachy, I think if you become too much alone, you can become a bit insular, and only have your own things to talk about, or rather things that relate only to yourself, so we can if we are not careful, start behaving in the very way that we dislike in others.