Sort of a complicated question, I'll try to ask. How was I born me and not another?

[FatAndFaithless]

I thought we'd already established that your parents had something to do with that?  Many parents do end up asking themselves that very same question in another form;

"Why did we have to have a kid, we could have bought a pet rock, and we'd be sitting on the beach sipping fruity ass drinks right now!"

Okay, it just came to me that I could ask the question a little bit simpler.

What are the chances of me actually being born?

Do you mean, out of all of the possible combinations of your parents' genes, what is the chance of getting any specific set? Otherwise it's 100%, since you're here to ask that question.

And..that's not really a simpler question. There's a lot of philosophical baggage tied up in that short sentence.