"Sometimes I wish I hadn't been born (at all)." A question on this saying [inside].

Probably you have heard somebody saying this line before?
Maybe even said (or thought) it yourself.
Now, imagine that you, being an egg or a spermazoid, knew about life and life’s troubles and daily pursuits, and you were milliseconds from entering the egg or being entered by the spermazoid, would you decide to ward off/swim on?
Or do you, with all its pros and cons in mind, love life, and are you happy that you have been put here?