First time I thought about CTB was when I was around 13.
Around 17 or 18 I accepted that I would probably die by my own hand some day.
So far I haven't done it yet, despite having wanted to many, many times throughout the years. I want to again nowadays. And I feel like even if I don't manage it during this depression, a new depression will come and make me end it.
The only thing that makes me doubt it, is I've historically been very hesitant to actually go through with it.
So I give it about 8 that I end things within the next year. And about a 9 that I end things eventually.