I don't drink.
My parents started giving me little swiggles of wine when I was about 14 or 15, so that, along with spending time in countries where the drinking age was 16, took care of any curiosity I might have had about alchohol.
I'm 21 and never been drunk, though!
My 21st birthday was the day "Harry Potter and the Sorcerer's Stone" premiered, so I went to see that instead of spending the night at some bar.