Stuttering and booze

Stuttering and booze Hello! Before a presentation or any time I have to talk in university-related matters (I am a senior student), I take a few shots of whatever I have lying around. Sometimes it makes my speaking bomb af but sometimes it makes me nervous as hell and I stutter like crazy. I know that it’s a 50-50 every time but I can’t stop drinking booze before talking-related situations. Does booze calm you down or make you more nervous? Does anyone have similar habits? P.S. I am not an alcoholic.