Same here (40). I no longer enjoy spending time with my friends.

I've tried to force myself to socialise, but I always leave early (I cannot bear it), stressed and sweating through my blazer armpits, and just happy to leave the occasion.

Family seems so much more important to me now, and only somewhat stressful.

I guess I'm an introvert. I don't think that's ever going to change, and I've come to accept it. I lose energy when I'm with strangers. I don't want to do that anymore unless it is absolutely necessary.

Also, I am happy. I do not feel lonely. I may also be a bit of a hermit.