@FnX: that's a poor stereotype of cannabis users. Most stoners i know are pretty fucking active and live high stress lives actually doing things every day.
for OP: it's your tolerance. Cannabis is an entirely different drug to people who use it everyday and its effects are vastly different from a new user. It may also depend on the strain, if you got a strong sativa then it can make your thoughts race/paranoia so just smoke regular cannabis and not stuff that is really high in thc (strain) which is usually a hybrid of some sort, at least in Canada it is. If you smoked 1 hit of some regular shit you should be high, that's the kind of high stoners get, they don't get the whole psychedelic high after long term use.
being high isn't always being slow, trapped, dumb or paranoid. If it were nobody would smoke it.