I don't want to end.
That doesn't mean I would never take my own life though, for example. There are times and situations where life or continued living doesn't have value. The cost is too high. I don't know for certain what I'd do, but I wouldn't want to 'exist' if that meant being in agony that couldn't be relieved, constantly (for example).
And for lack of a better word, I'm sure that most people wouldn't want to exist if that existance meant a constant torturious hell with no hope.
However, some form of afterlife where I continue on, as myself, without being sick, without pain. Sure, I'd love it.
I'm not a huge Ayn Rand fan, but I recall her saying in an interview after her husband died, that if she believed at all in an afterlife, she'd immediately kill herself to rejoin with her husband. I respect that statement because if I knew I'd exist happily as myself in some afterlife without pain or illness, I'd do the same. Being in pain isn't fun.
I've noticed that people I've talked with about this subject who do not want some form of eternal existence have basically come down to saying because experience is finite and existance wouldn't be, that eventually it would be a boring hell. I don't know about that.
I do know I don't want to end, and whatever amount of time I end up allotted will be too short, but I try not to obsess on that too much. Its inevitible, I'll find out the answers then, and until that time, I'll enjoy what there is. It's not to say I don't think about it, I do. Or that I don't worry about it, or fear it...I do. I really don't want to end. But in a hundred years or less (probably much less) I'll know for sure, one way or another. And non-existence only matters now, because when it happens, I won't be anywhere anymore to care.