If you actually read the Terms and Conditions, file your taxes in February, and tend to keep everyone from accidentally burning the house down, you may be an ISTJ.
If you consider strangers merely friends you haven't yet met and can oscillate between deep philosophical despair and pure euphoric joy in the span of an hour, you may be an ENFP.
If you are the one who organizes the group vacation (from the itinerary to the snacks), or if you have ever successfully talked a stranger out of a bad decision in a bathroom line, you may be an ENFJ.
If you have a rich inner life that could rival a Tolkien novel, or if you have ever apologized to an inanimate object because you bumped into it, you may be an INFP.