Interesting question..
Do I want to die? Yes.
Let me explain why..
I believe, and I've actually spent a considerable amount of time thinking about this, if you were to live forever, you would exceed your own interests, and it would eventually become something of a choir. Something you hated, despised. There has to be an end, as humans, we're built that way. Not only that, but mortality gives your actions and your life meaning. The fact you will die one day and never be around again makes the things you've done, the things you do, worth something. No one who comes after you will do the same. None who've come before you have accomplished as much.
Our nature doesn't really permit anything else. We're meant to die.
I don't think you should fear death so much as accept it, death is inevitable. In a strange sense of the word, to me, that makes it beautiful. You will, inevitably, fulfill your destiny, regardless of how you lived your life. It's closure, completion, the ultimate acceptance.
Beyond that, I wish I could live 1,000, 5,000, 50,000 years, but not forever. If you lived forever, you would play out every possible scenario you could think of. Life, I think, would eventually become boring. To me, being bored has always been unbearable. I also believe, though, that if death wasn't inevitable, I probably wouldn't have any concept of boring.. Somewhat of a philosophical paradox..
I am not happy with my lifespan, 100 years (conservative!) is not enough.. I think an acceptable lifespan would be 500-1,000 years, and I don't believe that's asking too much..
We're working on it though. I won't experience it, and neither will you, bur our descendants might.. maybe in a few hundred years, they'll figure out how to live to be many hundreds of years.. the trend so far seems promising.
You and me though, must accept mortality, it's sad, and it sucks sometimes, but denying it only prolongs and perpetuates the fear that comes with it. The best thing you can do is live healthy, be active, and hope you weren't dealt a genetic card with a date with the reaper many years before your time.
The saddest thing, imo, is those that get terminally sick in the prime of their life without any sort of warning to prepare.. Those that had hopes and dreams far beyond what their punch card says.. Leukemia, cancer, AIDS...