I can actually pinpoint the very day I became depended on alcohol due to a thread I made on here many years ago,
http://forums.overclockers.co.uk/showthread.php?t=17637307
It's interesting having it logged, you can see how it all began, the simple act of being stressed in work leading to just 1 tin of beer a night, sounds perfectly innocent, but when I look back at that thread I think even then I must have known I was going down a bad path, the thread was just blatantly asking for peoples permission to drink so I could excuse myself.
My advice is if you feel your becoming depended on alcohol no matter how little you drink then listen to yourself, you are having those feelings for a reason, don't ignore them.