You'll have to take an actual Myers-Briggs personality assessment elsewhere, but once you do (or if you already have), swing by this site to find out what the results REALLY mean. For instance, me:

INFP: The Idealist

The INFP is a dreamy, imaginative, idealist, capable of finding the good in anything or anyone, even something as foul as Newark, New Jersey. INFPs are sometimes dangerous to the well-being of society as a whole, as they are prone to adopting subversive and destructive ideologies like "The world should be fair," "People should treat one another well," and "You know, 'Friends' is a really, really stupid television show."

These irrational thought patterns may sometimes cause INFPs to run off and join the circus, the Resistance, or the Rebellion, where they tend to do well in any position requiring excellent hand-eye coordination or mastery of the Force.

COMPATIBILITY: INFPs and ISTJs generally exhibit a natural predator/prey relationship, which, though it might appear harsh and cruel from the outside, is all part of the natural cycle of life. In fact, were it not for the predation of the ISTJ, the population of INFPs would soon grow to unsustainable levels, overwhelming the ability of their ecological niche to support them.

Famous idealists include that girl in your sixth-grade homeroom who got the teacher fired for saying that girls aren't good at math; that guy in the cubicle next to yours who got the manager fired for saying that women don't make good employees; and Anais Nin.

(PS: Careful about wandering off that particular page. Some of the other pages on that site are NSFW.)