I want to die because of existence basically, I simply don't see anything desirable about existing and I guess that can be seen as the 1st reason. Regardless of the circumstances not existing is preferable to me, being conscious and aware just causes me to suffer. Human existence is just a futile and torturous burden, there's no point to existing, existence is just meaningless suffering, I simply don't wish to have the ability to think or feel, instead I just wish to be unaware for all eternity, all that comforts me is the thought of being permanently unconscious.
And for number 2, it's because to me suicide is all that's rational, in my case suicide is the way to avoid all future suffering in an existence that can potentially get so torturous way beyond how anyone could imagine. I'd always prefer to permanently not exist than to end up suffering for decades just to be tormented by old age dying slowly and painfully. Ceasing to exist cannot ever be bad as nobody can suffer from the absence of existence and I don't want to suffer in any way.
Number 3. Because existence is so evil as it's the source of all suffering and I find it such a terrible, horrific tragedy how life even exists at all. Honestly I don't believe suicide even needs reasons behind it, my wish to die is really just a result of becoming aware of how truly undesirable existence is, anyone with awareness should be able to understand why people would prefer to not exist.