Hoi!
For this, I'll be completely honest.
Yes, I have thought about harming myself, but not because of bullying or some other issue that would make me want to. Many kids in my school had this scar on their arm. Whoever had this scar was "cool". Naturally I wanted to be "cool", so I went home and tried to cut into my arm deep enough to create a scar. Fortunately, my dad stopped me before I actually hurt myself.
I was about 10, and in 4th or 5th grade when this happened.