There is no situation imaginable where the world is better off with you gone, and in no way will you be better off gone either.
This is flat fucking wrong, as various euthanasia and life imprisonment/execution cases should make incredibly bloody clear.
Particularly with the latter, I continue to maintain that with incredibly rare exception anyone that holds that as true has never actually felt substantial and sustained pain before, among other things. There are lives not worth living, and saying otherwise is doing an incredible freaking disservice to the people that live them, for however long they do.
... that said, for someone still in high school and not inflicted with something chronic, incurable, and incredibly crippling, definitely wait another decade or so before doing anything permanent (and yeah, I'm
entirely aware how long that sounds to someone in the situation given). With the hormone muckery and personal/social instability that's going to be a fairly prominent feature of the next several years, you're not going to be in a good position to really decide whether it's something you genuinely want to do, as opposed to simply your brain and environment screwing itself. So... give it some more time. Things'll change, and then the situation can be reevaluated.