No, it's not true for all people. The vast majority of people have socially-created identities, but a very small percentage of people can consciously strive to

No, it's not true for all people. The vast majority of people have socially-created identities, but a very small percentage of people can consciously strive to ground their identities in something else, e.g., the here and now. Devout introverts still likely have socially created identities. The applicability varies based on the degree of conscious effort applied to change identity.