yes i do know others that SI. my best friend self-injured from the ages of 10-15. When we were in 6th grade she told me that she cuts herself off and on. I wondered why she liked it so much so one day i tried it when i was 11 and i’ve been hooked ever since. My girlfriend also is a recovering self injurer. In August 2009 i was hospitalized because i tried to commit suicide. In inpatient as well as outpatient i met quite a few cutters.
Person [female, age 15, began to SI at age 11]