The bolded statement reminds me of something Lenore Thomson says in her book regarding E/I mistypes. She says that male introverts are more inclined to mistype as extraverts because of social expecations. I do not have her book any longer but she referenced to two to three questions from her assessment where if you answered "yes" you may be subjecting to yourself due to this principle. I am curious as to hear your reasons for being adamant (outside of the typical stereotypes of ISTPs).
If you knew me in real life you wouldn't question my E

and I don't doubt my type as an ESTP in the slightest. If anything I'm closer to an ENTP than an ISTP as I have a fairly high N... for an S but then again most ENTPs I don't get along with! (Past the first interactions.)
Why am I an E you ask? I bounce ideas off others, I'm socially inclined, I'm usually the center of attention (or another E is), I'm interested in others, I work well in groups, I love "salesman" jobs where I get to talk and use my communication skills, I love having company with me, I go out every weekend, I party a lot, I'm very outward in my expressions etc etc the list goes on...
About the only introverted thing I do is spend a lot of time on my computer, but thats where I work and the internet is pretty social imo.
Do I care for being an E just cause its more socially accepted? Hell no its just
who I am. Heck I have many introverted friends that are great company! Love them to bits... its just different to how we interact.
I'm not sure what Lenore is trying to get at, you are the one type and that never changes you cant BECOME another type just cause of social expectations. Sure you can
act like another type but its not going to be comfortable. I know an INFP in fact thats trying very hard to become more extraverted but she is still using I over E. I doubt she will get over her need for personal space etc
While I know I'm an ESTP I'm curious as to why you are questioning your type. Does ISTP not fit?