There is no "I" in "You"

[Thumpalumpacus]

Can anyone answer why you're you.....and not me?

By what method of determination do I experience existence separate from your experience; more to the point, what determined both our particular experiences and could one have been shunt in place of another (by what alternate means could I have experienced existence through your perspective or vice versa)?

Why here, why now...why not exist a thousand years from now or a thousand years past?

Can this ever be coherently approached or determined materialistically/scientifically? Or, is metaphysics a fundamental necessity?

Our limits are defined by our crania, and our cerebral cortices processing sensory information. Metaphysics need not apply.

We can each get a simulacrum of the others' experiences via language, photography, filmwork, or music ... or even empathy, if we're in tune with the folks we love.

As for "why here, why now"? I'm not sure there is a reason, nor am I sure there's a need for one.

I'm me because my experiences are locked inside my cranium, only able to escape using language, art, and literature. Because those are imperfect means of transmission, you can get an idea of what I experience, but you cannot experience it yourself, because abstract, symbolic languages cannot convey the richly-detailed nuances of reality.