I find a similar problem when I think about it. I dont think its just nothing though. The way I justify it is from my belief in ghosts. Not in the our souls forever walking the Earth kind of way though. I see ghosts as being sort of leftovers from a life that attach to things that had significance to them. I dont think that we will all end up ghosts though because the only ones Ive ever heard of typically have some sort of tragic death or some more unusual story. My point is that since some people become ghosts then that gives me good reason to believe I wont just cease to exist