I tried at 8 years old, but it wasn't that serious an attempt in my opinion. I tried to drown myself. I remember crying and feeling so lost and stupid and broken inside, while my parents yelled at me to stay where it's shallow, because they thought it was an accident. (My dad swam to save me).
I also tried at 12, and that was a bit more serious. I tried to overdose on hydrocodone, crushing and almost a whole bottle, and I remember feeling really happy and then dizzy for what felt like a split second, and I was proud of myself for finally leaving, but then I threw it all up. And I remember waking up on my bathroom door, feeling super super dizzy and my chest was heavy, and hours later at 4am, I got up and went to my bed and just cried. I was so upset I failed and once again felt so stupid. I was stuck wondering why it didn't work and how I could be so stupid and why didn't I do my research and all this stuff, and I felt so empty. The next day I had to go to school, but I left my first period class and then hid in the bathroom with my razor, and I cut myself 4 times and cleaned it and everything, and I stayed in the stall just crying and sitting there and numb until lunch. They called my parents for skipping class, and my parents yelled at me when I got home, and I cut myself once more. Then I just felt kind of numb and didn't even really cry for the next month.
And then years passed but the thought of killing myself never left my mind, I've just been so afraid of failing again.