Probably triggering:
I don't really remember the first time I did anything considered SI. For as along as I can remember, especially around age 6-10 I would scratch scabs completely off and then I would finally feel calmer (had pretty bad anxiety issues around that time). I would also intentionally trip or fall down alot, even on rough cement.

I had tried to cut myself since around 12, but was always afraid to. I'm not sure why but considering how suicidal I was around that time it's a good thing, I probably would've killed myself. When that form of SI actually started I was 15.
First time I overdosed was when I was 16. I wouldn't consider it a suicide attempt, but either it would kill me or it would be an escape, I honestly didn't care if it killed me. I'm not sure if that counts as SI or just getting high. I'll put it here anyway.
I'm nearly 18 now, stopping all of this very soon...