[vintermann]

Questions of self-identity aren't scientific questions. Science, or experience more generally, can't tell you who you are, or indeed, even tell you if there's one of "you" in your head or many. If you assert that you are not the same person you were five seconds ago, that's a scientifically unassailable claim - as well as impossible to prove to others.

So no answer to the question "who am I" is strictly speaking true or false, in an objective sense. But that doesn't mean all self-interpretations are equally good. Some self-interpretations can be very destructive. It doesn't take much imagination, or reading history books, to see how defining yourself to be multiple persons/personalities can be very destructive.