After 10+ years in the FIRST Robotics Competition, taking on various leadership roles and finally returning as an engineering mentor, I am now a very different person from who I was when I first joined my local team as a freshman.
Once upon a time, I was an INTP-T; today, I count myself an ENFJ-A.
There's really nothing like FRC to make an introverted geek feel comfortable and secure in your shell, and then to crack that shell wide open and drag you kicking and screaming into the light!