Hey El. Unfortunately when we are trying to quit or cut back on drinking we must stay away from those friends who we know will be drinking when we hang out, at least until you gain enough strength to not participate in the drinking.
Waking up in the hospital after a night of drinking is a big deal. I hope you are not taking it lightly. You are only 20 and although you say that you do not crave alcohol or need it to function I can tell you from experience that before you know it you can easily be in a position where that changes.
best of luck!