if you drink fast you shouldnt drink spirits it is simply because you drink faster than the alcohol is absorbed so you go from sober for an hour or two to rat arsed
i can drink and appear ok and not remember anything next day from a certain point in the evening it's quite common
other things which make a difference are hormone levels ie your menstrual cycle i find it is more likely you will get ratted before a period and particularly have this need to get drunk and the sudden change from ok to pissed
also nerves and stress possibly about the social situation makes a difference
if i was you i would never drink spirits
and of course the advice to pace yourself is sound
also wwhether you have eaten enough is a major major part
and how early in the evening you start
try not having a drink until after 9 when you go out and definitely not priming yourself up before you leave home
find someone in your group who drinks less and moderate yourself with their drinking avoid going to the bar when no one else needs a drink
remind yourself that you are going to drink less when you go out as it is easy to forget and accidentally get pissed