I was on the same point, earlier in my life. 4-5 years ago. After work, I'd fucking polish off a bottle of vodka, straight. I'd wake up with puke beside me, not known how I'd get to bed because, I'd always black out.
I was sick of everything that came with drinking.. My chick from college and I just quit drinking, started to workout and now... I don't really think of it any more.
It was hard at first to stop because, fuck man, all I wanted was a little vodka but, I knew if I wanted results, I wouldn't be able to. That's the beginning of my health kick and now look at me.
Anyone can quit, I think the key part is having support system. And even if you don't, you'll still do fine. I didn't have much of a support system then. My mom could've cared less if I choked on my vomited and died... And people at work then, fuck! They'd want to drag you down and get you drinking, "aahhh... whats one drink going to do?" ... Eventually after hearing NO a billion times, I stopped getting asked.
Just need to put your foot down, do not allow others to influence and if, You want it as bad as you want to breathe, you will fucking get it!
No excuses!