"Square" - now that's a term I haven't heard in decades; but I hear you. I dunno what the current term is either, but it describes me as well. Never tried any of it, not even booze or cigarettes. Didn't see the point.
I've smoked cigarettes & dipped snuff & chewed tobacco & still smoke cigars so I ain't no saint... Don't drink as much as I used to but still drink a little... But never wanted to try other stuff...
Square is the only term I could think of... Nerd to me holds another meaning.. Fuddy-duddy I guess fits too but not to me.
I'm just not HIP man........ I did wear bell bottoms @ one point...