An INFJ frequently mistyped as an INTP?

I'm an INTP who thought she was an INFJ. It's a pretty common mistake, I think. A lot depends on how you've been encouraged to think due to your experiences (like how much you will value thinking/feeling because of _______). I find that Ni and Ne can be told apart by how we express our excitement about things. I ultimately figured it out because of that, because I clearly use Si and a lot of it, and because although I appreciate my Fe, I get told off a lot by ENTPs for being rude and selfish (technically speaking, it is true that I don't think about others very much because I expect them to work around whatever I'm doing, just like I'll work around whatever they're doing, unless we openly agree to adhere to one another's wishes). I am quite obviously, upon closer inspection, a dominant judger and extroverted perceiver as well if I look at my organization habits. It's all very internalized.

I originally thought I was an INFJ because I am fairly emotionally focused. I am a writer, and I write fantasy, and I like whimsical, girly crap like fashion, and shoujo manga. I used to have a lot more drive to complete things than NPs are usually credited with, as well, and felt very J-ish in a lot of ways, though tests usually had me straddling the line. I mistook Ti for Ni. Since then I have learned a lot more about theory and determined a long time ago that I am definitely an INTP (though I did briefly consider INFP and ISFJ, but I'm actually a pretty strong Ne user, despite my obvious Si habits, and Fi/Te is pretty alien to me).

I also think Ti and Ni cause similar facial expressions - a sort of blank, emotionless face - when they are being utilized.