Do you have anecdotes about how you were as infants, toddlers and young children that could point to your being INTJ?
My mother saw my personality early, it seems. She said I had "that intense, contemplative gaze" and that I "never cried, even when we forget to feed you for eight hours". I was silent and never complained about a lot of things and was well-behaved in public, but seemed hypersensitive and intractable. My parents threw away the piece of napkin I was playing with, and I bawled for a week, refusing to accept another piece.
My intuitive tendencies started to show around age 4. My mother still talks about my unrelenting questions about death, and my toying around with the concept. It was around that time I got a new nanny who was in her forties or fifties. Then I remembered that old people die (in those days death was my new intellectual toy. I couldn't get enough of it and constantly wondered about it), and that if she was old, then surely her mother would be dead, and I couldn't imagine living without a mother, so I asked her, in a very convoluted way, whether her mother was dead. My rough words are: "Some creatures don't live very long, while trees live for hundreds of years. Humans are somewhere between, so... Is your mom dead?"
When I was 8, when my grandmother died, I was the only dry-eyed person, aside from my two year old cousin who was probably too young to comprehend anything. Even my aunt (by marriage) cried, and knowing her she probably didn't care for my grandmother, but when other people cry, you tend to cry. Not me. Here was a woman who practically raised me, and I didn't cry. I don't remember the next part, but my mother reportedly (this was from her) asked me why I didn't cry, and I told her it was because death was a natural part of life, and we really lose nothing by it. It's quite amusing, actually, how your thought patterns don't change. Before my mother told me this particular story, I was thinking back on the episode and reflecting on my attitude towards death years later (when I was nearly an adult) and I came up with the exact same explanation: "Death is a part of life. There's nothing inherently bad about it." So when my mom told me about it, I was like: "yeah, sounds like something I would say."
I was a morbid little creep, no questions.