I am an INTP, and I am going to explain you myself. Different events shaped my life, but I would mention, in chronological order, three of them.
As you know, as you might know, INTPs are too "lost" in their mind and in ideas to have time to pay attention to people, they do not even understand themselves...and that was me, it was me until mid of my (hopefully still a little longer) life, it was me till somewhere around my early 40s. That's why what happened happened. Number one. When 30 years old, as a perfect naif "nerd", I made two (wonderful) kids with a Narcissist, a real one, and that's a scary disorder, specially if the life of the two persons who matter the most to you, your kids, is strongly impacted by that and you need to "save" them, but you cannot get rid of the problem... This forced me to focus my attention on him, the father, on his functioning, on the why, on his distorted reality perception and manipulation, on the other people's perception, on the effect of his behavior on my kids, and on how to mitigate such effect in a way that would made of them as healthy as possible people (longer explaining about this another time). Number two. With 40, I fell in love with a INFJ (without being aware he was one). Madly. Obsessively. A INFJ who, as being such, wanted to care for me, felt bound to me, but had a different vision for his life, he was convinced he needed something else to be happy, and you know what happens when a INFJ has a vision, and a plan...he pursues it restlessly, (and take action to make it happen, doesn't matter what)...but my "interest", my absorption with him was total, and you know what happens when INTPs are interested in something...they can only focus on that one thing, so I dissected him, I analysed him, I took him (mentally) apart, I understood everything about him. Number Three. I was sent to a course where I took a MBTI test...and I discovered the Myers-Brigss personalities theory, to be myself an INTP but, above all, what all other people were...and this closed the circle...As you know, INTPs are too "lost" in their mind and in ideas to have time to pay attention to people, they do not even understand themselves...except when People becomes their focus, their main interest, their obsession...than they cannot clear their mind, they need to know, they need to grasp everything about that specific thing...and that's what happened, that's why I now understand everything about people, about emotions, about human interactions...and I would like to explain you...