I understand how you feel. I too am alone, and I don't like the fact that I have to be on medication to be considered normal. But I need it. I alienate more people being off it than not.
I don't have a diagnosis from a psychiatrist. I'm just chronically depressed, and citalopram (Celexa) is a wonderful thing.
P.S. Go read Topher's thread titled "call me crazy" in the creativity corner forum. Hopefully it will give you a laugh.