I tend to score close to 50% on the introversion/extroversion metric, but always leaning to the introversion side. I think the truth is that I'm a little schizophrenic, I'm pretty sure I'm introverted most of the time, but I can appear very extroverted other times.
I find it easy to be outgoing and enthusiastic if I'm giving a talk to an audience, or if I'm volunteering and my role involves talking to people and helping them out. I've loved the few teaching experiences I've had, and I think I'm quite good at engaging people at a bake sale stand, or when handing out flyers etc.
With my friends and loved ones, I have no trouble being bubbly and outspoken... I trust them and i feel like I can be myself. Quite a few of them are introverted too and I have no issue just hanging out in each others presence in comfortable silence (eg one person one the computer and one reading) punctuated by occasional updates on funny/interesting things we ve read/seen. Equally I love one on one discussions over coffee or brunch and hearing about my friends lives, talking through issues, giving each other advice etc.
But that's where my comfortable social interactions end... I don't feel extroverted with my colleagues or with big groups of people. I feel quite inept at being part of the conversation, it feels like by the time I've thought about what to say the time to say it has gone and when I do say it they re not on the same wavelength at me. I find it hard to open up and I feel like they re only ever going to see the surface. It just so happened a colleague bumped into me when I was volunteering at a museum and giving a talk to about 20 people about a science topic - she seemed very surprised at how comfortable and bubbly I was then, compared to how I am at work. I think I come across as either stupidly shy or slightly aloof.
So... I think I'm 'extroverted' around good friends and complete strangers whom I'm unlikely to see again, but I'm introverted around acquaintances and everyone else. Hard to know who the real me is! Is that part of being an INFJ?