When I first started working for A-B in the mid-80's I was asked to take the Meyers-Briggs test which came back showing me as an ESTJ. I've taken the test multiple times since then and always come out an ISTJ.
I am pretty sure I answered the way I thought my boss expected me to, I was promoting beer and theme parks in a very high energy office surrounded by very extroverted people. I probably felt I needed to be "more out there" than I really was and answered accordingly.
Fast forward 30 years and I know without a doubt I am not extroverted and never was. Articles like the one below reaffirm my ISTJ results, I dislike noise, I HATE surprises and I love my privacy. While I like being part of a team I don't feel the need to be vocal 100% of the time, instead of talking about it I just want to get the job done.
And when the job is done, I don't need to talk about it or look for praise, I feel a job well done speaks for itself.
If there is one thing I've learned over the years it is to appreciate my introverted gifts. They have served me well in the last 15 years, I've become a better person and have a successful business as a result.
So, to all the 24 year old's out there trying to make your mark in the world listen up: it's OK to be introverted. It's actually a really good thing, you're cool, you're fine and don't let anyone bully you into thinking different.
Great article on Quartz about being introverted: http://qz.com/142590/the-six-biggest-mistakes-of-managing-an-introvert/
For anyone who might not be familiar with Meyers-Briggs http://en.wikipedia.org/wiki/Myers-Briggs_Type_Indicator