There is an inherient fear of death that we have within us to preserve our biological function, obviously. It is primal and fundamental. It is difficult to truly escape this fear, when you’re actually faced with death as opposed to just thinking about it academically.
Spirituality, futurology, philosophy, and any other theoretical application to thinking about death are ultimately fruitless when you’re actually about to die. These are things for the living.
I know one day this will all end. My brief, weird existence will end as quickly as it begun. I have to live my entire life trying to come with terms with that. It’s never fair, it’s never easy, it’s never a good thing. But it’s needed, and it’s inevitable.
In spite my best efforts to keep healthy and physically fit, my death can come at anytime. You’re never ready for it. It’s something to be afraid of.