If everyone wants to go to heaven how come nobody wants to die?

Answer 1

If you know for sure, beyond a shadow of a doubt that you are going to heaven, then you wouldn't care if you're going to die. That doesn't mean you would want to die, that especially doesn't mean you'd committing suicide. All that means is if you're going to die, you don't have to worry about where you're going.
Answer:
Not everyone wants to go to Heaven. As Mark Twain discusses in "Letters From the Earth" Heaven may not be as pleasant as it is supposed to be. Other people would prefer a much more interesting thing to do with an eternity than any of the Heavens proposed in the Earth's many religions.
As far as not wanting to die to get to Heaven, this is reportedly the reason that fanatics blow themselves up.