I have a theory that kind of makes sense.
I think that when you get down to it, there is only one particle in existence!
One thing, whatever that is that makes up the tiny bits of all of the atoms. There’s only one, but it’s everywhere. It expresses itself a billion, trillion zillion times everywhere because it’s massless and moves faster than light tunnelling itself through spacetime to wherever it’s needed.
But here’s the kick. The awesome power of this particle means that it has to be slightly different wherever it goes. Slightly different in terms of energy so that when it bumps into itself it has the experience of meeting something different and perhaps bonding with it or being repelled by it.
It also likes to hang out with other versions of itself, .
It sounds a lot like a human.