I fear the end of the world because I fear death - not just my death but everyone's death.
It is no good saying that you will be okay because you won't know anything when you're dead - it's the 'not knowing anything' that scares me.
It's no good saying that if you believe in a hereafter you can look forward to eternal life, because eternal life scares me too: I have to know there is an exit if I want to get out.
In fact, I am afraid of the unknown: this is why I am afraid of death, inconsciousness, anaesthetics, sleep, deep water, pitch darkness, strangers and the future.
I am also afraid of being trapped in a situation I can't get out of: the hereafter, tunnels, caves, lifts, planes, relationships ...
Guess I am in the right forum, then!