The self has a heritage even if the self refuses to accept it. You are your parents' child and not someone else, for the same reason you are also a human, a hominid, a mammal, not a fish or a tree.
If you're alluding to the existence of some transcendental self, can you at least accept it is inseparable from your corporeal self?
I have plenty of evidence that we're bags of chemicals wandering around a rock in space, and our consciousness is the results of electical signals passing through our synapses. If you wish to reduce the majesty of nature to "unknowable", you reduce your own position to unknowable too. If you're fine with that, I'm fine too, but I still like my position better than yours.
Oh wait, you changed what to who, didn't you?
Boom, thanks, and ouch... I guess.