death

There's something I'm kinda curious about that I've been actually pondering for a while. This is the debate over death. Not is it right or moral or whatever, but actually, why are we so dreadfully fearful of death? Especially us Christians of the world... we know that when our time is done, we will go to the place of perfection and eternal bliss. So why is it that we don't want to live this corrupt, screwed up world full of sick people? Yes, some people do have a legitimate reason such as a family that loves them or depends on them or both and I completely understand that.
I know from my perspective, I'm scared of death probably more than anything. I even go so far as to wear dogtags with my ID when I go running just in case something were to happen I would get by a car or something. It controls my every move and action.
I only have a few possible explanations as to why I'm so fearful, one being the fact that I have a family that would be devastated if something happened to me, but more recently, I have a girlfriend who cares for me and would be crushed if something were to happen and I know that, even unintentionally, I couldn't do that and bear to put her through that much. I know some people think that sounds corny and "twitter pated" but it's true.
I guess in the long run, I don't fear death, I fear leaving those people that love me so dearly and whom I, too love.