I remember I was about 12. I was struggling with feelings towards a friend of mine as well as some other guys at school, and wondering what was wrong with me. My stepfather wasn't the nicest person, and I didn't have an ideation of suicide as much as just a general feeling that the world was wrong, I was wrong in it, and I needed to leave to somewhere else than this universe.
It stayed with me for several months, then abated somewhat as I loved my mum and had a good summer when it turned around from recollection.
However that feeling - of not belonging, stayed in the background. As I got older, as in most things, life took off. I moved state, went to Uni, met a girl, got married, had kids and got a job all over about 6-7 years. When I was diagnosed with a chronic disease and became really unwell a few years ago things probably went pear shaped, and culminated in the rather nasty dissolution of my marriage (was jointly at fault, and she cheated on me, but convinced myself I was to blame really).
It's been over the past 2-3 years that feeling has returned. I see things on the news and it just reinforces my belief there is something wrong with this place, and rather than being happy people go out of their way to beat, take, lie, cheat, and generally hate each other. I see little glimpses of beauty, but they are far far in between all the crap people heap on each other.
I've come to the conclusion that while I couldn't exactly verbalise it when I was a kid 30 odd years ago, I was probably experiencing suicidal ideation then, buried it for a number of years and while it was always bubbling away in the background just got on with trying to survive. In more recent years I think my mind has now moved to a point where I am aware of it, gradually coming to terms with it, and more recently landing in a head space where I think it's very near time for me. I don't want to be in a world like this, and my biggest regret is I've punished my kids by putting them here too, given I see the echoes of what it was like for me in them, when they don't understand why people are like they are.
Either way they will benefit from my demise, their mum loves them regardless of how we get along and I can only hope for them it is better.