It sounds like you may be using alcohol as a safety behavior, to decrease your nervousness when in social situations. Safety behaviors are used by people with social anxiety to decrease the discomfort of the anxiety that is triggered when with other people. Safety behaviors include drinking more alcohol to take the edge off. Other safety behaviors include standing in the corner so nobody can see you, not making eye contact, smoking, and leaving the social gathering early, just to name a few.
Drinking alcohol to take the edge off your social anxiety does work in the short term, but it makes your social anxiety worse in the long term, as you never get to find out that just by socializing with people and not medicating your anxiety away with alcohol, your anxiety will go away naturally, on its own. And a major problem with alcohol as a solution to your social anxiety is that alcohol is highly addicting, and you could be dependent on the alcohol and develop alcohol dependence/abuse. So if you use alcohol to reduce your social anxiety, there is a high risk that you will develop an addiction to alcohol.
Fortunately, there are other ways to decrease your social anxiety naturally, such as taking KalmPro (a natural supplement for anxiety), and/or seeking self-help treatment with Anxiety Protocol.