Neither of my parents are alcoholic. They were social drinkers, parties, holidays and such. They never drank just to drink.
I didn't drink because I was around it and in fact I was turned away from it early as my brother was an alcoholic and I had a fear of being like him but doing things because of fear only last for so long. My fear turned to resentment.
It does run in my family though. Grandparents, Aunts, cousins etc.
They say it can be hereditary and there can be a genetic predisposition to alcoholism.
In all honesty I don't really care about all that. Today I don't look for why I have the problem. I use my energy in solving the problem. I like to use my time to learn how to live sober and on lifes terms rather then trying to understand or explain how or why I am an alcoholic.