A lot of people new to the theory who have issues typing themselves think that but this isn't true. The theory doesn't work that way. That people type you differently has to do with that quite frankly, most people on this site don't know how to type people. I don't want to boast, but I think I'm definitely one of the more accurate ones who are active on this site. Which is to say I can be wrong too, but I am more likely to be right than I am wrong.Eh, I mean, it helps; but everyone types me different. I'm still more frequently typed SP, but I could very well be SJ or NF. I don't know. In conclusion I guess that I may never know exactly who I am or how I think. All I know is I am who I am and I feel what I feel and act how I act. It's hard to judge someone over the internet, and maybe that's why I've had so many different responses...aside from Extroverted and Feeling aspects, everyone seems pretty clear on those ones Reading about my enneagram makes me feel as though there is no better fit for me, and that's why I like it. When I read it, it felt like the person writing knew me. I don't know if anything could ever fit me better.
I grew up in a bilingual house and I've had to adapt and interpret from a young age. I've been almost two people since childhood, but I suppose most people probably have been. I think for me I use many of my functions so frequently and they're all very developed. People have trouble identifying me. But at least I know who I am, and that's all that matters in the long run.
The reason why people may have issues typing others are many, but in the case of someone having issues identifying themselves it probably boils down to that they are what Jung would consider an ambivert, that is, someone who is neither an introvert nor an extrovert and because of this, their functions are as a whole, undifferentiated. They are in other words typeless, which is not the same as using all functions all the time randomly and haphazardly. Rather, what it means is that their use is so fundamental and basic that it essentially plays little to no importance to them psychologically. This means that they don't really express any real preference for any function, which may make it more difficult type others.