Whilst I agree LH about some of your "certainties" I have doubts that those who die very young will have time to feel any of them. When one gets older then I hope that we all have the chance to experience them, but I repeat the ONLY certainty in life is DEATH. From the moment we are born we start dieing, its how long that process takes that matters, and what we do in the meantime of course.
Some of us lead very fullfilled lives and will feel/experience many things, others hide away and suffer them rather than live them. I would wish that more people made the effort to live their lives to the full, rather than just exist as some people do.
Am I an optimist or a pesimist? I do not know.

Colin