Then let me put it this way:
Why do you think people invented the "afterlife"? The fear of non-existance is so great, after you actually comprehend what that means, that people had to somehow lessen it, and so that's how the afterlife concept was invented. Heaven and Hell are just some crappy ideas made to give sense to good and evil in life. If there is no Heaven or Hell, good and evil are both invalidated concepts.
Sure, you can believe that there is actually something beyond our realm, it can make death easier, but I prefer to take it as it is.
Well, you can consider that too, but since everything ( including time itself) has an expiration date, try to make the most out of it and learn to be happy. You can also go ahead of time, since death will eventually come, but you won't feel happy, you won't accomplish anything. Make a purpose for yourself, since that's what you are here for, not something else.