That's probably due to the internet. Actually, I've tested plenty of times both INFP and ENFP either way. I grew up REALLY shy, but I also learned how to be outgoing as well as I grew older. In a way, it's more of a defense mechanism than anything (considering I just joined this site). I'll usually feel the need to be a little bit more extroverted if I'm uncomfortable (which you've substantiated). If I had posted poetry or something instead, would you have judged differently?
Beyond that, you would probably have to know me to really know what I'm about. My values, the way I think, how I act. I may claim to be a party type, and I can definitely hold up with the best of them, I'm also not out drunk right now, am I? :) I've read up on the ESNP type, and while I do tend to "enjoy" being the center of attention at times (who doesn't like attention?), that's not completely me. I lurked on this website far longer before I decided to actually join and post, not really thinking I'd be attacked on my own personality at that point! I'm not sure why I'm having to defend myself here, but do you do this often?
What exactly made you post what you did about me so quickly, despite whatever you may have seen in my posts? In a way, I could say you are far more extroverted than you claim, considering how vocal you were about me... and so quickly! Does that make sense?