For the longest time I used to believe that I was an ISTJ. I'm very hard working, place great emphasis on trust, and typically will endure a fair bit of self-sacrifice for typically bad reasons.
Recently however, I've been doubting my ISTJ status. I read over the type descriptions again recently and INTJ seemed to fit better this time, but I'm concerned that I may be biased.
Typically, I understand, the way to evaluate one's type is to look at one's dominant and secondary function. (In this case Te happens to be the same.) I believe I use Si a fair bit. Naturally it makes sense to compare things to as they have been. I also see a fair bit of Ni in myself as well though, as a I strive to frequently understand abstract ideas, and playfully muse in my mind about crazy thoughts.
So I'm not sure. And I know this has been discussed many times before, and I've done some research, but I can't claim certainty and I want to make sure I am not biased.
My guess is that my true type would most quickly be determined by questioning, so go ahead and fire away.
EDIT: And if it means anything, my best friends are mostly Ns. My one friend is a strong INTP, another a strong ENFP, and another an ENTJ. Ss I don't seem to connect with as well.. I do, but typically I feel somewhat arrogant in their company, although I take care to try and treat near everyone equally (except those who plainly don't deserve it).