It definitely runs in my family, then again, most of us cousins had alcoholic parents so none of us got an easy ride growing up. A lot of stress, uncertainty and lack of sleep pretty much the whole time. So it could be either in my case. Oddly enough, I myself don't drink much, I seem to have an intolerance for alcohol, a few beers can put me down for days. I'm no saint though!

It seems to have gotten worse as I have aged as well, although I do remember being very depressed even from an early age, around ten years old is the earliest I can remember being that way.