There may be something after death, there may be nothing, I don't know. But think of it this way; A forest is a forrest, and a thousand years later we'll still call it the same forest, even though non of the original trees inhabit it. But the forest continues to exist, and the trees don't care, because they have no ego. The ego will make you believe, whether you know it intellectually or not, that your existence is the only existence. When the only means of percieving the world is through your own eyes, it is impossible to percieve existence when you are dead, and the mind cannot therfore comprehend existence continueing on when your own brain doesn't see it. The illusion of self is what truely frightens us.