You are NOT a psycho. Try to stop being so hard on yourself (yes, easier said than done and I'm a hypocrite) - self-injuring does help with emotional stuff. It's a coping mechanism, like it or not. Just not the healthiest one out there.
I have tried to explain it to people before, but only a few. I've been lucky, most of the people who figured it out or who I felt "safe" with telling, they already knew what it was. For some people though, I still haven't figured out how to explain my behaviour or motivation. Too hard.
(((((((((((((Candy)))))))))))))
ps. Sorry for being so harsh.