I was in your shoes for a long time in my early twenties - drinking all the time, taking short periods of time off, but never seeking medical help because, 1, I didn't want to admit that I was really an alcoholic, and 2, I thought I was too young to have a real problem with alcohol. I truly wish I had sought some real medical help back then, before things got much, much worse a few years down the road. You are definitely NOT too young, and if a doctor doesn't take you seriously (a few ER doctors didn't take me seriously when I first began going to the hospital for withdrawal), then find a new doctor who knows more about alcoholism.
I second what everyone else has said - definitely get some medical help to get you through detox, and then look into a program like rehab (in or outpatient), AA, and/or another support group. It's great that you are ready to quit now, at a young age, and while you are still employed. You can do this!!
