If self harm was for attention, we'd do it in front of your faces. We wouldn't barricade our bedroom doors' lock the bathroom door, cover it with long sleeves, do it places no one will think of looking, look so ashamed when you ask to see it, be socially aware for ourselves, be laughing one seconde then silence the next, keep everything from you if it was for "attention". It just so happens you found out, probably by an accident. Don't get involved.