I Am An Alcoholic

So I am a high functioning alcoholic, I still go to university, and work, volunteer, have a great social life but I find myself sitting there wanting a drink, I find myself needing a drink and I don't get it, it's like it stops my thoughts and the pain (physical pain I'm technically disabled) or at least stops me from noticing the pain so much it curbs my anxiety so I don't feel so scared in social situations and I feel as though without alcohol I'd probably have no friends, because I really struggle to talk in public without a couple of vodka's, this morning I woke up with a rotten headache from last night and decided I'm going to do a 31 day challenge, no alcohol for 31days but I'm already staring over at that bottle of vodka on my desk, I can almost taste it and it's driving me insane my friends are out tonight and I'm thinking I should go join them for a dance because drinking is okay if you're not alone, right? That's always been my justification for drinking so much, I am a student and I never drink alone, I'm just bored and out for a fun night, if I say it like that people over look that I've been 'out for a fun night' almost every night for the past 4 months, I suppose the problem is it doesn't stop me from doing anything, I'm still at university I still have a job and friends etc...
Recently I've been getting angry, I've been feeling the urge to drink more, so I'm not sure if I'm an alcoholic but I feel so close to it that I'm not going to drink for 31 days just to make sure, I'm going to see how much money I save in that time.