One of the hardest parts about being an Atheist is accepting that there is no afterlife.
Someone once asked me what death would be like, and the only answer that I could give was that it feels the same as forcing yourself to remember a period of time before you were born. In other words, it feels like nothing. It didn't hurt before you existed because you lacked the pain receptors to feel pain, and the pain of dying will only last as long as your body remains alive to feel the pain.
Experiencing death is an oxymoron because you can only experience something as long as you remain alive--after that, you're back to the void of non-existence. There's also no point in worrying about what happens to you after you die if you can only control what you do when you're still alive.
The upside to this is that the sooner you accept that there is no afterlife, the sooner you can move on to making the best out of thislife.
On the other hand, being an Atheist means that you don't need a supernatural justification (much less superstition) to live your life. People die, calamities happen, and bad shit will inevitably happen to you simply because you still exist and didn't have the prudence to "duck' when misfortune was thrown your way. Life can suck, so bring a shovel when it does suck, but don't forget to take advantage of it when things are really going your way.
What you do between birth and death is entirely in your hands--so what are you waiting for? Start living. :)