Hello Lavie @laviesm, hope you're having a beautiful start to the year.
Neither did I. I observed kids fighting over dolls and throwing tantrums while playing. The sense of ownership really started early for all of us. I guess we were naturally brought up identifying with the stuff we own, as soon as we associate them with possessive pronouns. I read somewhere sorry can't remember which book but "a car" got scratched and dented elicits a different emotional response to "my car" got scratched and dented.
Can't believe the first week of the year is almost done. Wishing you a lovely evening!