For those that don't fear death (for other than religious reasons), why not?

I wouldn't say that I really fear death. Being scared of it is not going to prevent the inevitable end from coming anyway, so what's the point of worrying about it when you have no control over it. Plus, without modern medicine I would have been dead 28 years ago, so all of this for me is just gravy.
But I do fear missing out on things I still haven't had a chance to do or see or experience, having regrets, before my time is up. And I am afraid of the fact that I won't be able to be there to help those that I leave behind.


What is the one thing that you wish family and friends who don't suffer from a mood disorder would most understand about having one?