Hi David,
don't worry I am also shy and have owned my smart roadster for 4 years now, the roadster is even more of a headturner than the for2, and people are always coming up to me in carparks and asking me about it, it is no problem as they have asked me a question about one of my favourite subjects, my smarty, so it is easy to talk to them as long as you know a little about your car, so gen up before you get it so you won't be thrown by any questions.
Hope you get one, as they are brill.
Ellis