I fear it because the fear of non existence, to me that is frightening, I don't want to "not exist" or no longer to have any sense of self or consciousness.
Life seems rather pointless if you simply live a short time, you understand what life is, the act of being alive and the concept of death, but then there's simply nothing afterwards? What's the bloody point of that? That means that every single evil person who did evil things to improve their own selfish lives while screwing over and harming other people get off scott free in the end, and those that try to do the right things, even at their own sacrifices, get the same ending. If you just live a short time and that's "all" there is to your entire existence in any space or time it seems like a cruel joke to me.
Give me any ending but non existence, let this world be but one step on a journey, one from which you had to have "no memory" of the before in order to complete it and when you die you don't simply blink out into nothingness.