What part of the brain controls your individual center of thought?
I mean, if you cloned yourself, you can't think in that clone's head, since it's an individual all on it's own. You can't think inside other people's heads either since they are not connected to you. You see with your own two eyes, hear with your own ears, and think with your own brain. But what if by some random chance you weren't born in that microsecond when you biologically formed inside the womb as a sperm fertilizing the egg? Would you still see the world through the 1st person view, or would you be nullified into oblivion?
Beyond all that, is there an ultimate core inside the brain which controls your focus and overall sense of self? What if you replicated that core and put it into other potential living beings, would you be able to have those individuals mimic you in every-day life?
What if you were cryogenically frozen for 500 years, and with the acception of a few organs including your brain were all damaged by the freeze, how would they implant "you" into another body? Also if scientists were to find a way to transfer information in your brain so that you'd be immortal among technology, how would they transfer your sense of self into the computer's hardware so you won't ultimately die?
It's a nightmare to think about, how your sense of self can't be replicated or transferred without the risk of having your overall witnessing and awareness vanish just like that.