How the Myth of the Self Endures Years ago when I first started thinking about this only thing I found reflecting my thoughts was "Why am I me" by Scott Bidstrup who seems to have died now. He was an engineer among other things.
https://web.archive.org/web/20020402181037/http://www.bidstrup.com/why.htm
"In a strictly material sense, it may be true that the matter that makes up me could have made up a tree, or a lizard or a rock or anything else. But what we're talking about here is consciousness; in particular, the consciousness which is unique to me, and not shared by anyone else. The matter that makes up my body has little relevance to the fact of my consciousness. It doesn't do one bit about explaining why I am me in terms of my consciousness. It just explains the fact of the carrier of my consciousness, my physical body. The body should not be confused with the consciousness. It's like confusing a program running on a computer with the computer itself."
"The personal distinction, which I experience as a personal consciousness, is quite independent of the matter that makes up my physical body, as when, for example, if a chunk of me is removed in surgery, I do not continue to experience what is happening to the removed chunk; it simply becomes a part of the world I experience and is no longer "me."
If that chunk includes living cells that are cloned into another complete, living, breathing, human being, that human being still isn't me, even though it had its beginnings in my body. "
He then goes on to like Julian Barbour's theory relating to multiverses saying roughly that each moment of our self is a trajectory through another multiverse. I am not convinced by that idea but it does make the point about the uniqueness of the personal perspective.