I Took The Jung Typology Test

ISTJ
Introvert(100%) Sensing(12%) Thinking(38%) Judging(44%)

You have strong preference of Introversion over Extraversion (100%)
You have slight preference of Sensing over Intuition (12%)
You have moderate preference of Thinking over Feeling (38%)
You have moderate preference of Judging over Perceiving (44%)

I used to be ISTP when I was in high school though....