I believe that anyone having thoughts like that, needs to get professional help. That's a serious thing, and and unqualified or bad advice could make it worse.
With that said, I feel that having and building confidence in oneself, and remembering that there IS a future, and one DOES have control over a lot of things in that future
. To commit suicide is cheating, and it hurts everybody else around, and although that might sound like sweet revenge for some people, those people will get over it, and move on, and the one who killed self, can't.
Charles