Let's face it: If you're human you have most likely experienced a fear of death at one time or another in your life -- or else you may have been in complete denial of your fear and repressing it. That's because the fear of death is normal for us Earthlings -- we have a survival instinct that motivates us to avoid death-inducing situations.
Death represents the ultimate unknown, a territory in which we have no experience and no control. So it is natural to feel fear when we think about death and also natural to avoid those thoughts whenever possible. But it turns out that this avoidance of death doesn't serve us well in the end.