THE PARADOX OF EXISTENCE?

HOW intriguing:
WAS debating with someone about how someone might not have been born or come into existence had their ancestors chosen a different history.

SO if my ancestors had decided to do A instead of B, different dynamics would have come into play, who they married, where they lived, what religion they would have practiced, and therefore the likelihood of ME being ME, would not exist.

I could still have developed as someone "else" though, right? IF ancestor A married ancestor C instead of B and had moved to raise a family to Australia instead of North America, doesn't mean some DNA wouldn't have been passed down to me eventually anyways.

BUT why even contemplate the question?
IF I didn't exist, I wouldn't be aware of my non-existence so the point would be mute.
AND if I did come into existence, how can I envision how different I would have been if my ancestors went a different way than the way they did?

IT is to me, the same as the question of death.
ONCE I die, I will not have any memory of having existed.
OF course that depends on your religious views, but I am an atheist.

SO, in short, why would death scare me? ONCE I am dead, there is nothing to be scared of, I won't have a memory or any awareness that I had ever existed.

Death can only be scary if I though that there would be some "awareness" of my existence after I had died.

So, whether I might never been born had my ancestors done something different from what they did, or when I die, either case, I would not have been nor will I be aware of any other existence except that which I am NOW.

RIGHT?