Hey Naomi,
As Dee said, try the hotline, or a walk in centre if you start to feel withdrawal symptoms, it can be dangerous.
Hope you stick with it, alcohol has clearly caused problems, so is a problem.
Try blogging about all the bad stuff, how bad last night was so you can read it when your addictive voice starts telling you it wasn't that bad and your young and all that rubbish it tries to feed you.
I used to drink like you, was consumed by it at work, thinking and wishing the day away so I could have my first drink. It got worse, binging over a litre of vodka a day, not a good path.
I even went missing once and ended up in sheffield! drinking with the homeless guys near the train station. Thankfully I still had a home to go back to, but some of those guys had lost it all. One was still technically a student at the uni but had completely hit the bottom and not done anything to change. He was in very bad health and I wonder to this day if he's still alive.
So it's never too young to do harm, or to make a change!
Take care