I totally understand the confusion between being an E and an I. I'm usually a quiet-ish person who enjoys listening to other people talk than talking myself. And I spend a fair amount of time on my own in my room. But I'm an E. Oh well. :P
It's good to hear I'm not the only one.
On another note, I think an INTP would have dealt with that above situation differently - by mostly ignoring the guy (not really bothing to be polite since the situation was rather awkward), and definitely not mentioning the candy left on the counter! :P