I was talking to a co-worker this morning about personalities and the Myers-Briggs (wiki) personality test. I took it years ago, and was an ISTJ. So, I looked it up on Wikipedia and reread the ISTJ type description. It is CRAZY how much this fits me to a T!
I – Introversion preferred to Extraversion: ISTJs tend to be quiet and reserved. They generally prefer interacting with a few close friends rather than a wide circle of acquaintances, and they expend energy in social situations (whereas extraverts gain energy).
S – Sensing preferred to iNtuition: ISTJs tend to be more concrete than abstract. They focus their attention on the details rather than the big picture, and on immediate realities rather than future possibilities.
T – Thinking preferred to Feeling: ISTJs tend to value objective criteria above personal preference. When making decisions, they generally give more weight to logic than to social considerations.
J – Judgment preferred to Perception: ISTJs tend to plan their activities and make decisions early. They derive a sense of control through predictability.
If you haven't taken the test, I highly recommend doing so. It takes some time, but if you get your answers and then look up that personality type you may be surprised to see the quirks you have and things you do that other people with a similar personality also have and do!