Dickie and I heard a radio story about salespeople (that was the only reason he was paying attention) and the interviewee described the best sales folks as ambiverts.I think I am right on the tightrope of introvert/extrovert. I don't need alone time. I don't feel drained by being around people. But at the same time, I have no need to be around others. I would do fine living alone.
Basically they roll with the flow; sounds a lot like you.