It's not so much the death aspect of it as the "I'm not sure theres anything after death." that scares me.
Same here. What I figure is that it's going to happen sooner or later, so why let it bother you? If there's an afterlife, you'll get there when you get there. If there's not... well, by the time you realize it you won't be in a position to worry about it!
The important thing is to live your life the way you want to.