"What doctors do know is that OCD is a medical disorder; it isn’t the fault of the person with OCD or the result of a weak or unstable personality."

From: http://www.helpguide.org/mental/obse...sorder_ocd.htm

I was struck by your knowing you had it at 4 years old. Did something happen (parents divorce, someone important to you die, etc.) before then? I don't have OCD, I have GAD, General Anxiety Disorder, but have done some "checking" to make sure things are right in my time too :-)