I'm between an INFP and INFJ. A strange sort of in-between since the difference is typically between F and T in most instances but I'm certain that currently I'm an INF_. Although everyone has the possibility of being more than one at different times.
And I believe the reason why certain people take interest in personality reading methods is because there is an intense need to understand themselves fully. At least, that's why I love Numerology, Astrology, Tarot, Palm Reading, Face Reading, Big 5, Jung, Myers Briggs, etc.