Socializing is hard for me, but I enjoy it when I'm able to relax and connect with someone, which is rare. It uplifts my spirit and makes me feels really good to enjoy the company of another person. I think that's true for all of us.
Unfortunately, with SA, most of my social interactions aren't enjoyable. I'm too inside my head, struggling too much to keep a conversation going. Most of the time, I find it too difficult to connect with people and express myself effectively.
I get what you're saying though. You want to have close friends to spend time with, but not casual interactions with acquaintances or just people you don't know much. I suppose I understand that. Our friends are our friends because we enjoy spending time with them. With people we barely know, we don't really have any deep or meaningful connection built to enjoy the interaction as much. We may not even feel as at ease than with our friends so it becomes less enjoyable. It feels like something we have to do just to be polite or something.