I can relate.
Personally, I wish my mother had had a miscarriage or something.
When I was a teenager I had thoughts about jumping out of the window or going to a high building a jumping there. Maybe I should have done it. I was so little but already had so much trauma under my belt. Those thoughts weren't obsessive thoughts but nevertheless.
As an adult I think I should have done it last year. I stupidly didn't do it because I kept hoping things would work out with this guy I was talking to and maybe then I could give life another chance. It was this teeny tiny glimpse of hope I had. But he turned out to be a pathological liar just wasting my time. Still kicking myself for sticking around and not seeing through his bs earlier. But on the other hand, it gave me time to save a bit more money for my death trip.
Like you said, I bought into the "it gets better" lie for way too long. Especially when I was religious. So yeah, I should have ctb-ed already and yet I am still rotting here. In a month I have to start my preparations - book flights, hotels, try to find N, or find SN if I can't find N. Etc. Lately the only thought that's on my mind is - "will I really pull this off??"
Once I book everything and embark on my journey, there will be no such thing as going back. There is nothing and no one to go back to, and I will have spend all my money on the trip. There is no future for me. At least not the kind of future that I would like.