How do I know if I'm an alcoholic?

[Not Heidi]

All I have to go on are these:

1. I usually have a drink at any opportunity: out to dinner, offered a beer at a friend's house, having a shot if there's any vodka in the house . . .

2. I try to keep vodka in the house. My roommate drinks it, too

3. Sometimes, when I'm buying a bottle at BevMo, I'll get a couple of those tiny bottles - and drink them on the way home. Yes, while driving home

I know I can live without it. I don't crave it; I don't get drunk - I don't even get tipsy. My roommate can buy her own.

But being able to quit (as I know I am) doesn't equal quitting. These are my questions for the ether: am I an alcoholic? Do I need to quit?

Please offer your opinions.