[MENTION=20059]NKC[/MENTION] - I happily accept the possibility of any MBTI matching up with any point on the Enneagram, and speaking as one who identifies as
both a 7 and INFJ, I might have some useful insight here.
INFJ and 7 together is a strange personality. It's conflicting in places and typically doesn't make sense to those who have not had to intimately consider the possibility for themselves. Having said that, I
am going to challenge your type - and not because you've combined them as you have.
Although you insist that you are not, you do seem (or at least initially, did seem) rather sensitive to others' questioning of this pairing. Yes, it's not what you asked for, but it could play an important role in sussing out what type you actually are, Enneagram and otherwise. Your reactions were a little quick and accusatory, but what gets me the most was your level of surprise.
As far as I'm concerned, it's a foregone conclusion that there will be many people who look at a type 7 INFJ and declare that such a thing can't exist. Some of them will not take you seriously, unfortunately. It's hard not to be painfully aware of the fact that this is such an oddball personality. Consequently, your reactions seemed a bit hasty and insecure to me, without forethought or broader perception.
(I feel quite secure in my own self-typing, but I could consider another MBTI type if someone were able to logically convince me that it was a better fit. So far, nobody has done this, and I have developed a rather persuasive system for explaining the bizarre juxtaposition of my cognitive functions and preferences with the fears and drives of a type 7.)
Additionally, you don't write like an INFJ. Your words meander without any apparent sense of calculation. Writers typically know how to use their linguistic tools, and I consider communication an art. I write, and I write often, because I love doing it. I have general visions of whatever it is I'm intending to say, and I then craft that statement carefully when I wish for my words to have an impact. My perspective is subjective, of course, but I have a hard time with the concept of an INFJ who writes the way that you have and then finds herself caught off guard when others challenge it. Not saying that it couldn't happen! It's just highly unusual.
I'm also getting a lot of Fi, very little Fe. Fe would probably
not toss the word "retarded" around and then go, "Hey, fuck you guys if you wanna call bullshit, but please don't be offended, but really, why are you guys so pissed off, jeez." Not when dealing with first impressions, anyway.
(This isn't to say that I don't have a lot of "fuck you" in my own personality. I do. I have tons of it; however, I generally know when and where to apply it for best results.)
I've also noticed that you seem pretty hung up on your past. I'd like to know how you feel about the future, where your focus is, and how you perceive time.
I could more easily swallow the 7 pill, but I'm not one hundred percent convinced there, either. You seem quite reactive, maybe even accidentally steering yourself into conflict - but I've often done this myself (my sexual variant may be to blame), and a heavy 6-wing might contribute to your push/pull energy.
Type 7 isn't just about having a sunny disposition, either. Remember, the Enneagram is about coping mechanisms, what we fear and what we want out of life. Why are you such a fun-loving, pleasant person? Do you do it for yourself? Do you do it for the people around you? What's your main goal when you try to keep things light and fluffy and feel-good?
7s seek external distraction because their inner worlds terrify them. While it is (probably significantly) less common,
this does not mean that 7s cannot be introverts. I'm not an extreme introvert, but I'm introverted nonetheless; people and crowds do not bother me, but I find that I don't really
need them for energy and will eventually tire of them. (I don't really need anything for energy, actually, I have some insane internal surplus that probably borders on clinical, but that's going off-topic.)
I still reach out to my environment or interact with it in other ways, though. For example, if I'm not working, I will write a lot, plan my next trip, check airfare, try the new restaurant across the street, take photographs and spend hours editing them for my latest project du jour, do research on my newest hobby, play
NHL 14 until my thumbs bleed - anything, really, as long as I'm not experiencing any kind of stasis. Boredom is the root of all evil, and provides ample opportunity for those internal anxieties to confront me. (Fortunately, my internal wellspring of creativity is so great that I rarely ever experience boredom.)
Anecdote/example time: I was feeling a little unhappy earlier this week, and I ended up (twice) at a dance club, getting drunk and losing myself in those awesomely beautiful strobe lights. The second time, after I'd sobered up, I walked to my car and drove first to the grocery store and then home. On the way, I spontaneously burst into tears. Dance club = me running from unhappiness, drive home = just enough time to think about my actual volume of happiness. I always purge those gross emotions quickly, rebounding to feel great again within hours, but it's there, and it's one of the biggest driving factors in my whole existence.
Having said all of that, I'm not a healthy 7. Not unhealthy either, just average, floating around mid-range, doing things average 7s do. It's entirely possible that your especially bubbly disposition could be related to a higher tier of health (and/or higher levels of extroversion). I don't know you personally, of course, so all of my opinions here are meant to gently suggest new possibilities and get you to ask questions that, perhaps, you haven't considered before - or disclosed to us.
Ultimately, I cannot and will not say what type you are, NKC, because only you can decide that - no matter what anybody tells you. I'm only sharing the little things I've noticed, so take them with a grain/block/semi-load of salt. If new opinions are what you're after, well...maybe you can get to the small details if you refocus on the big picture first. More information is needed, I think.
I hope I haven't stepped on your toes, but this is something you might want to think about if you're seriously invested in figuring yourself out in the name of personal development. (If you'd like to know a secret, I actually put more stock in the Enneagram at this point than I do MBTI.)
Anyway, it's late, and if I go to sleep now I'll still get two hours before I have to start my day. It's going to be another Red Bull breakfast, I think.
Oh, and welcome to the forum.
EDIT: [MENTION=18576]Sanjuro[/MENTION] has some very good points as well - great post.