Alternatively, you're part of a relatively limited slice of a generation for whom "not sharing" is an odd, sociological outlier compared to those which came before and after. The 40s were war years, and everyone had the shared experience of having to contribute in some way - across most of Europe the stories are of shared communities and experiences. It's only in the time since then has the notion that everybody can be absolutely private in their affairs gained the traction it did, especially in the US.
This was then crushed again starting around the 80s when censorship rules began to be overturned, and you see the beginnings of it in a generation of filmmakers who wanted to see what they could put on screen, and the slow rise of the internet and the generation which would eventually come to be part of the Google/Facebook generation.
If you think everyone else is broken, it's more likely just you are.