I watch a lot of British TV shows. If they are any indication, drinking alcohol is a much bigger cultural deal than it is in America. First, we have a lot of people "in recovery" (alcoholics who have had to give up drinking) to the extent that it is pretty well accepted. Second, we have a number of religious groups (such as Mormons) who never touch the stuff. Third, there is the phenomenon of the pub and the "local," which would appear to be much more the cornerstone of social life in the British Isles than they are here.
I have never been pressured to drink more than I wanted to. At most, I've been offered a drink as a courtesy, but not with any expectation that I need to accept it. Among young people (especially fraternities!) there is a culture of heavy drinking, which is one reason we have so many recovering alcoholics. By my age, most folks know all too well what a hangover feels like, and would rather not have one.