I'm super extroverted (which I know isn't your question) - but a correlative indicator
Ironically, I was voted shyest in high school. I love being around people, but I also cherish my "me time". I have a crew of friends, but I know other people that are more "connected" than I am. I would say I'm in the 75th+ percentile on a scale of socialability, lol. I'm the type of person that will naturally just step in and lead.
I have a very small family (grew up an only child, but found siblings later in life) and was always super jealous of people who had lots of family get-togethers, etc.