How old are you though?
I think that those under 30 own fewer possessions for various reasons, whether that be because experiences are seen as more worthwhile than objects, or whether that be because digital purchases are cheaper than hard copies, but a big reason is that so many of them live in rented accommodation, very often a single room, and very often being forced to move to another place.
It’s just not practical to own all that stuff these days for many, many people.
Books do seem to have held up though, against e-books, and it’s not just explained by the generational thing.