The secret of happiness is to think about death every day.
Remember those you know whose bodies have already expired, even if you did not know them well; to have know and shared a moment with them is enough.
You do not have to believe in an afterlife nor be a religious follower to reconcile yourself with non-existence. To be content in sharing the same state is enough.
Your body will not be the first to die; and nor will it be the last.