I could just quote any one of the answers already posted. They all say much the same thing, and it is exactly my opinion on the matter too. I want to live until I want to die, and I don't want to die 1 minute earlier than that time.
And btw, you say we will eventually have 'deep emotional pain' as if that is a bad thing... I enjoy experience. Even pain can be a positive experience. If you want to be numb, there are plenty of drugs that can do that for you...but why go by halves? kill yourself now* and remove all chance of ever suffering through pain again.
*Aegist does not really recommend you go kill yourself, it is a rhetorical device. Although aegist believes his advice is 100% philosophically valid, killing yourself is always a bad idea, because there is no chance to change your mind. Staying alive affords you the freedom of changing your mind at any time.
Lol... And I must add, killing yourself is the biggest error can be done- the only error of which you cannot learn from...
-Infernity