I cannot comprehend ceasing to exist as a whole..
I'm very aware of my thoughts and the feeling and sound of my fingers typing right now. I've always comforted myself with consciousness. Basically "If I'm aware right now, then it's impossible for me to lose this sense of awareness because there is everlasting consciousness." However, I was soon put down by the realization that it's possible that I'm basically not even conscious right now. Sure, I think I'm aware of what I'm doing right now, but in a few weeks or months I may never recall the feeling or sound of typing this ever again. This probably reads awkwardly but it's because I can't really mold my idea into words.
On topic though, I really want there to be an afterlife. But even if there isn't, I won't be aware that there's not.