I have a hard time believing it just from the way you interact in the forum.
INFJ's tend to be quieter - yes we can be rowdy, but it isn't "normal" - the phrase "still waters run deep" I think applies to the INFJ in particular. We also tend to be very honest in our communication methods, and excel at written communication - here I can best organize my thoughts, and say exactly what I mean
So for me, the way I type reflects my personality "at rest" as it were - yes, I can definitely be more extroverted, and depending on what is said in a thread I may reflect different attitudes.
But you seem rather.. over the top, for an INFJ.
I have a hard time reconciling your style of writing with that of an INFJ - you can run a simple comparison yourself. Look at some of Silk Road's, Z Buck McFate's, Lily Flower's or my posts - any of the INFJ's on this site really. You'll notice a lot of similarities.
And your posts stand out in stark contrast to them. Not similar at all. Granted, INFJ's do learn to be more careful about how they present themselves, but it's rare for someone to be that complete of an actor as to represent themselves as something entirely different. More to the point, it's draining to "act" differently, and as the internet bears no recriminations, it's not harmful to be honest - that's one of the things I like MOST about this site.
So for the above reason. I would submit that you are not an INFJ.
It's not an exclusive club; it's not because we want to keep you out
It's because it seems obvious that your niche is elsewhere.