Are you saying suffering has no end, are we cursed ? Pains and suffering is caused by the devil, are we in his territory you saying?
I know a certain belief that teaches exactly that. Wherever you trust them or not, i cannot say. But suppose they were right, if you end now, you would remain in eternal pain. The thinking that death somehow means "rest" and "peace" is as much a belief as the opposite.
Fact is, we would never know until its too late.
Even if there is nothing afterwards, or repetition, it probably doesn't hurt to do good deeds, while there is a chance that harming others (or yourself) can land you in an even worse situation.
As for life being worth, i'm not sure either. What about death? Is it worth? Is there a Paradise waiting for you? Hell? nothing? New life?
Its all a matter of beliefs, but no matter what we say or think, we cannot change the truth, whatever that is. Perhaps we are too insignificant to ever hoping to learn it. I can imagine countless people in history trying and spending their life in pursuit of some enlightenment.
But, where were you before you were born? Where will you be after you die? Same or different state? Why is the universe the way it is, and not another way? Are there other universes we are unaware of?
Many people died when they didn't want to. Would they be happy of people who could have lived but ended it? Some say the afterlife is full of angry ancestors, waiting to make your existence miserable, what deed you did or did not do to somehow amend for their eternal suffering?