[it]

You know what's interesting? The social reflex that when something feels bad we explain it as bad by attaching another more reasonably bad thing to it.

For instance here the message is "suicide is bad because it abandons loved ones". That doesn't make suicide bad, it makes abandoning loved ones bad, which you can do without committing suicide, and depending on circumstances you might be able to commit suicide without abandoning loved ones - by not letting yourself have any.
Even then, it would depend on the nature of the relationships - not every relationship has a responsibility that can be compared to a father and son. If you are truly suffering from being alive, would your co-workers or acquaintances be as entitled for your continues suffering just so they won't experience that little moment of sadness? Can anyone truly be entitled to your continuous suffering?

I don't think it's question of worth either, though feeling worthless is probably a big cause of suffering, as can many other things be. Even if the world would in some ways be better when you are alive, even if you can be a contributing member of society or have a job that solves problems or improves people's lives, even if you can make friends laugh and feel inspired and entertained, and have people who's lives are a bit better because your around... Does that mean you have to stick around and continue to live in pain?
A lot of pain doesn't go away - you either adapt to live with it or don't. If you aren't responsible for anyone else, or if the people you do feel responsible for are better off not having you in their lives, or you might not even have any right to be in their lives, then... All that is left is yourself, and if we hold adults responsible for their lives, then staying alive has to be a choice they make, a real choice, and that can only exist when they also have the choice not too.