Yeah, no, you’re not an INFJ.
Okay, being brutally honest with yourself, are you angry, upset, shocked or otherwise unhappy with me? Stop and think about it. Does having your identity denied give you an emotional reaction? Do you feel the need to defend yourself?
If so, you really aren’t an INFJ. I would look at ISFJ, ENFP, or ESFP, which are three types I see mistaking themselves for INFJs most often. Also maybe INFP and ISFP. The thing that gets hurt at being questioned is Fi, and it is not a significant part of the INFJ personality. (ISFJs don’t have Fi either, but they do get similarly threatened by what they perceive as a personal attack.) I think a lot of these types enjoy that INFJ is a rare type, and they also enjoy the “psychic” description. If that’s part of why you think you’re an INFJ, you need to re-evaluate. INFJs aren’t happy to be rare – they know they are; they’re not happy to be psychic – they know they aren’t. Stop here, go look at some other profiles, Sorry about the emotional manipulation.
If, however, your response to my statement was to wonder why I’d think that you weren’t an INFJ and what that says about me, you might actually be an INFJ. INFJs have Ni as their dominant function – they are analytical first.
ENFJs mistyping as INFJs are probably early twenties or younger and don’t realize that they are sociable yet – their day-to-day activities aren’t helping them reflect accurate results. Try this. Go have a conversation with someone. When you stop talking does your brain kind of hibernate? ENFJs brains are crazy active when interacting with people and then not so much when not.
I haven’t really seen any INTJs testing as INFJs, although they have the most similar body language. I guess it probably happens. Take a look in your closet: are all the clothes organized by season and colour? Are all the hangers pointing the same direction? Are your bookshelves similarly hyper-organized? Does this give you tremendous satisfaction? You might be an INTJ, not an INFJ.
There are probably other types who commonly mistype as INFJ (maybe the odd ENTP – quick, are you having an existential crisis?), but those are the ones I’ve seen on youtube.
All this to say, I don’t know enough about the available tests to rank their effectiveness. Personally, I took the humanmetrics test, and it was right the first time about me and three of my family members, but wrong about the other two the first couple of times they took it (the descriptions never fit very well). Not the greatest odds, but it got there eventually. If you read through this post without any creeping doubts, then you probably are an INFJ.