My dad was in a political job that required international travel so I went to high school in Japan and Australia for a while. It meant that I had an external reason for feeling like an outsider, so I didn't have my adolescent identity crisis until I was about 20. It also meant that I viewed friendships as transient, which I think made me a very insecure person for a while.
At most of the schools I attended, I was awkward, nervous, and very involved in academics (despite being a mediocre student). It was an escape to pretend I was scholastically minded, given I felt very inadequate socially.
That said, I think my experiences made me a wiser adult.