View towards single men/women in their mid-30s?

I have a few married friends and I tell you, they hardly ever have anything happy to talk about. Most of the times is problems, arguments, poverty and is very depressing being around them.
They love talking about their problems and life all the time, and I would rather sit at the dentist than hear about their miserable existence.
I am 40, separated for 5 and half years, mum to three kids, and I am very happily single and for the foreseeable future I don't intend entering a relationship.
This hasn't always been the case, until last year even I very much wanted to be in a relationship.
Lately I have gotten so lazy and enjoying doing not much, that I simply find it a real inconvenience to accommodate anyone new or old into my life again, and that goes for friends too.
I just can't be bothered making time for anyone, remembering them, staying in touch, chatting, etc, I avoid visitors to the best of my ability, I don't encourage spontaneous visits, I dislike small chat and I really couldn't care less how they doing, particularly if their not happy.