Fear of failing in something you set your eyes on/got ambitious about? Is there a sense of insecurity there if things start to cut close on the border of success and failure for you INTJs?
I used to suffer very badly from the fear of not being perfect.
I wasn't afraid of getting a D; I was afraid of not getting an A.
Thank goodness those days are gone!
One thing that still makes me insecure is when my supervisor begins describing something new that he wants me to do, that I have never done before.
On the outside I look calm, but on the inside I am panicking, afraid I won't be able to do what's expected of me.
Over time, I have learned that no matter what has ever been asked, I always perform that task to everyone's satisfaction, so there's no real need to panic.
I think it's a natural response because I know INTJs like to be COMPETENT at what they do, so in my mind, my fears and insecurities are playing out because I'VE NEVER DONE IT BEFORE.
Once I've done a thing once, I am much less anxious the next time.