How much do I have to drink to be an alcoholic?

Really. I have a glass of wine a night (or a beer, if I'm in the mood). VERY rarely do I have more than one glass or one beer. I read somewhere that more than 7 drinks per week is unhealthy, but I'm not sure where I read that. I come from a long line of alcoholics and addictive personalities, so I always try to be careful with addictive substances, but it's not always easy to see, because addiction sneaks up on you and bites you on the bum. Perhaps the mere fact that I am WORRIED about it is a good sign I should 'fast' for a while .. ?