I notice the same thing but with happy family groups. I'm always aware of shows where there's a large extended family and everyone knows everyone's story, or helps each other like a team. The communication kills me the most, like when families are sitting around big dining room tables or celebrating the achievements / birthdays of one person en masse.
The show I noticed it most with was a TV show called Parenthood. I know it was overblown Hollywood stuff but at first I had a bit of a meltdown because I found their lack of privacy overwhelming, but within a few episodes I was so envious of it I was actually in tears. I had to ask a few online friends if that was "normal" family behaviour. I was shocked that they actually said it was.
My family is very small and very private meaning we don't tell each other ANYTHING. We deal with all our crises alone and very seldom get together even though it's just my kids, my brother, and my mum. When we're together it's a game of mutism because no one wants to upset anyone else by sharing their struggles or bad news, and there's never anything good to say.
As for friends, I've never really had any so I assume it's not believable. I'm not envious of it because I don't really want friends, but I'd love to have a communicating family. This mutism business is for the birds. I hate it so much.
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I never give you my number, I only give you my situation.
Beatles