The part that stuck out to me is that your Aunt is going to be huffy if you do not drink. I too was a binger. Once sober you learn that you have to do this for yourself. If your Aunt gets huffy then so be it. My true findings are that most people truly don't care if you are not drinking as long as you don't get in the way of their drinking.
I am not a believer in people not drinking around me because I chose to quit. That turns you into the reason everyone else can't drink... You don't need that pressure.