When I go out on the weekend with friends to bars and lounges, I drink a healthy amount throughout the night like maybe 3 or 4 shots and a beer or two. If it's football season I'm drinking like 5 or more shots (it's hard to keep count since I buy rounds and my friends all buy rounds and were cool with the bartender so we get free rounds) and probably about 3 tall beers. If I'm with my cousins, we drink like it's football season and we do it all day. It's 4 of us and we down 5 bottles of wine, 18 beers and a bottle of vodka in a 36 hour period.
Outside of those times though, I might go months or weeks without drinking anything. If I have alcohol in the house though, I will drink it and quickly. I don't buy alcohol too often though so this isn't really an issue.
Why do I drink? It's fun when you're doing it with friends or even strangers. I avoid getting wasted though. I associate feeling shitty, vomitting and everything that people who don't drink assume happens with even the slightest sip of Miller Lite with getting wasted.
my country is obviusly fucked up, here everyone drinks, legaly you can buy alcohol when you are 18, but it's often sold to even younger kids. For most people older then 16 it is completly normal to go out drinking almost every weekend.