Heres the thing...depression doesn't care who it effects. It's not picky. Whether you have reason or not depression can find it's way in. Until very recently I've had no real reason to feel depressed either but that doesn't stop it being any less real. And the cutting quite often goes hand in hand with depression too, as a coping mechanism. So depression is your reason for cutting. I do think you should talk to someone about this because it doesn't just go away on its own. I tried that for years and just got worse. Hope you feel better soon