I hate to say it, but I came from a "Leave it to Beaver" household, with an annoyingly functional family. Not terribly demonstrative, but that's the Nordic culture, I think. No addictions or mental illness to be seen.
Yet I wound up in two marriages to alcoholics, and became a nicotine addict and alcoholic. Sometimes sh*t just happens.
I'm sorry for how your childhood went--sounds like an awful way to have to grow up.