I took this personality test, recommended by Erica. Here was my (not frightening, but perhaps disheartening) result.
The agreeable nature and quiet personality of INFJs makes them particularly vulnerable to hurt feelings. Distress within close relationships can shatter the INFJ. Like all NFs under stress, INFJs feel fragmented and lost — as if they are acting out a part rather than simply being themselves. This disassociation can be related to physical symptoms for the INFJ, whether real or imagined. Feeling split off from their physical natures, INFJs may become virtually immobilized by repressed feelings.
Although INFJs may feel like remaining still and stationary until the chaos and confusion of a stressful situation dissipates, it would be best for them to actively sort out their needs from others. Being excessively cooperative and agreeable, the INFJ has a tendency to adopt values and beliefs of others as their own. When external conflicts grow, so does the INFJ's sense of personal disharmony. Disassociating themselves from others takes a great deal of effort for the INFJ.
I actually felt kind of sad after reading that. It's like way too many of my faults laid out by an impersonal test.