I don't think you're going to go this alone, cold turkey and socialising in your way of thinking are not a good idea, are the only friends you have the ones that drink 'moderately', not very good combination, I think you should speak to your gp, truthfully tell him how much you drink and how often and then maybe when you're off the drink, try going to AA meetings, it's your relationship with alcohol you should consider and not the maths of ½pints to pints etc. try go bowling or some other out of your comfort zone activity, you might find you have a new lease on life and make friends who are less alcohol dependant