I have been self-harming since I was 7 years old, technically.
At age seven, I ripped skin off the bottoms of my feet... I used clippers after the bath and would continue until they bled and had big lacerates in them. (I recently found out that [at least] one of my sisters knew about this, but never stopped it. I am the youngest.)
At age nine, I started out punching myself, because I felt like I deserved it. I had numerous bruises. I guess the bruises/scrapes/cuts I recieved while skating weren't good enough, because they were not intentional.
At age ten I added nail scratching to the list. I would scratch my nails against my skin until they were completely red. Nobody ever noticed, because they thought mosquitos were really irritating.
At age eleven or twelve (The exact age escapes me...) I began ripping the skin of my palms with a safety pin (or any needle). I had little red marks all over my palms, you couldn't see any color besides that, and even on my fingers too...
At age twelve I began stabbing myself with a push-pin/thumb tac, and pushing needles into my skin to leave them there. Maybe that is why piercings don't hurt? It was when I lived in my Aunt's home. I stabbed my wrists repeatedly, as hard as I could. One of them bled so badly, I have a big blood stain on the comforter I still sleep on.
At age thirteen I started cutting. The first cut I made was at age twelve, if that counts, but at age thirteen, I really started. If I felt like there weren't enough, I would make more... At one time, I had 100 on each leg. That was the first time.
I am going to turn 16 on July 18.
Currently now, I bite the skin off my finger tips, until they bleed, I rip the skin off my feet, burn my feet under scolding water, and (sometimes) punch myself/other objects.
Honestly, I miss stabbing my wrist with the push-pin/thumb-tac, cutting..., ripping skin off my palms, and pushing needles into my skin... I miss it so much...