What's interesting is relative levels of introversion tend to stay the same. If you went back to your reunion from school, you would probably find that if you ranked everyone in your class into terms of levels of introversion and extroversion you'd still be the same rank.
Relative to most people I know, I am comfortable just about anywhere. I went to 20 schools before the 8th grade because my father couldn't hold a job. We moved every six months. I had to adjust.
Rand Paul does not like being compared to his father Ron any more than sons named Bush like to dance in their father's shadow, but the crucial difference is that while the Bushes all hail from the relative mainstream of the GOP, the Pauls have an ideological tributary virtually to themselves.