Historically speaking this is incredibly wrong.
Nearly every culture evolved from some sort of shared communal longhouse to individual clan homes, to extended family homes. The idea of individual private rooms actually comes about explicitly from Manors in the late medieval ages. We really didn't see widespread individual homes until the industrial revolution. In places like the East, individual rooms were an import from the West.
Even in rare places where there were individual family homes (Ancient Egypt, for one). Privacy and individuality were just not concepts. Through the 1800s, you might have literally been sharing a bed with a stranger in a hotel.
There has also never, ever been a point in human history where living without some sort of roommate was common. Even in situations where you had lots of single workers, they almost always lived in bunkhouses or SROs.
