I too get these thoughts in my head every now and then. Yes, I know that realistically everyone dies at some point, but when I actually sit and think about it, I get really scared and depressed and can't sleep. I don't want to die. I love being alive too much. I don't know, maybe if I am lucky enough to live to a ripe old age I will feel 'ready', but I don't think I ever will. I have to push it out of my mind so I don't think about it and obsess.