Me and my father are both INTPs and we both did in fact have a rough VERY EARLY childhood (from 0 to 3 years old) due to family issues.
All INTPs I know from real life had some kind of weird shit in their early childhood, but I'm not clear on whether or not every INTP in the world could claim the same thing.
And hell yeah, when I was little, I used to despise feelings A LOT, dismissing them as useless shit that got in the way of the true living (thinking and doing what is right or whatever). I couldn't really understand why "other" people where so much about what they were feeling and so little about what was right/smart/useful.
As somebodiesfool says, I defenetely think it's a defense mechanism. I would actually go as far as to say that it's a deeply flawed one (as in: I'm getting shit from the outer world, every feeling I get is bad, thus I'll just create my own inner world and live here and fuck you and the emotions you give me, as if you could actually separate your inner and outer "worlds"), and it's not very useful in general. It does help in some really interesting ways though. (We're so proud of our "smartness"
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)
I am a very anxious person (everybody makes fun of me because if you give me a pat on the shoulder when I'm not expecting it, I'll have a giant "jump". I heard stuff like "dude, are you getting flashbacks from Vietnam?"
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) and I totally avoid conflict and fear confrontation.
That being said, feelings ARE a very important part of life, almost all of it, and even if we try to bury them, we have very strong ones (at least I do) that are even more childish because of the very fact that we try to bury them. So I am trying to work on being more open, exposing my feelings to others and all that bs. Which is actually good.
I generally don't believe that anything that is personality-related has much to do with genetics. This, because adopted kids really "work out" just like all the others in relation to their parents' personality, regardless of race/genes/whatever the fuck.
So I'm as interested as you are in understanding if this is a recurring pattern... Cause I'd expect it to be just so.