Once upon a time I thought I was an INFJ. Till I understood the cognitive functions better. I admit that thinking I was "a rare unicorn" was a bit tantalizing to me at the time but I didn't know any better. MBTI is a bit glamorized and who doesn't want to be the unicorn! LOL, but it just didn't "fit" me when I got right down to it. I am an INFP, through and through, and pretending to be an INFJ when it was so obvious I wasn't just seemed like I was putting on an act and not being true to myself. The whole experience did teach me a lot about the differences though. And the differences are not just the letters P and J, they are massive differences in personality. The main ones being an INFP's FiNe vs INFJ's NiFe. No matter how depressed or stressed one is, I think these two things will never change, honestly, but can present themselves in different ways atypical from textbook definition under duress. My experiences wrestling with my own type taught me a lot about INFJ's and how I am certain I am not one, but I am also confident that I can spot the real ones and the ones who are mistyped for whatever reason. My ex is an INFJ and I have a couple of friends who are as well. Knowing them, really knowing them, it makes me wonder why the heck I thought I was one in the first place, lol. Oh yeah, because this online test I took only once told me I was! hahaha! Anyone who is uncertain should do a little more research on the cognitive functions.