First of all, it was an overstatement to call the apartment yours. There was no private ownership of apartments in the Soviet Union. There existed only personal possession of small land parcels with small (or not, depending on the size of a bribe) houses.
Humans are a social species. This is not unique within mammals, as many live in packs. These animals enjoy support of other group members, but their roles are mostly uniform. At the same time, the level of specialization humans developed is barely comparable with social insects like ants or bees.