I couldn't 've been alive all that time, because I wasn't yet born.
You could have been, though. But clearly not being alive didn't bother you
then. Doesn't even seem to bother you now - it's not being alive
in the future that I imagine concerns you.
All I'm saying is, just because one is not allowed to become alive
right this very minute is not a very big deal. In fact there are trillions upon trillions of people who never become alive at all (many, many millions would have been your children), so non-life doesn't strike me as nearly as large a deal as you seem to be interested in making it.