I would say Fi is like a wound, and a bandage must be slapped on in order to function in everyday life and keep stuff from oozing out. If we think someone can heal the wound, them we may open it up to them. Ultimately, we must heal and be healed. Hence, being called "Healers".
EDIT: Maybe you're just a lot more well-adjusted than some of us Scott
If by well-adjusted you mean "having spent like 7 years in physics grad school", hmm, where is that "committing suicide" smiley when you need it???
Actually, I think its very funny, I've spent the vast majority of my life in VERY non-NFP environments: around the military, wanting to join the military, combative martial arts training, working for the government, research physicist, engineer. I feel like I'm the *posterchild* of what INFP's are NOT supposed to do in their lives...

I have been described as "tough" by a lot of people though...Hee hee hee, INFP warriors baby! Take that Rambo!

The thing is, when your doing those things above you understand WHY INFP's are not supposed to generally do them. Simply put, its in your face every moment of everyday of your life why INFP's generally aren't supposed to do those things. That's tough, that sucks, yeah real bad.
I'd guess that for a lot of INFP's its more an issue of feeling comfortable as opposed to being well-adjusted. I could be wrong though. I think a lot of external situations and/or people make us feel uncomfortable, as opposed to simply feeling uncomfortable on the inside.
Hmmm, I can't say that I've ever heard of Fi being described as a "wound" before...
Maybe this will be inspiring: In Lenore Thomson's
Personality Type [REALLY good book, VERY in depth and informative and thought-provoking], in the INFP section she says "[INFP's] realize that being responsible to their values isn't about fighting what exists; it's about building, recognizing that they can do things,
want to do things, that might not even occur to others." See your Fi as the strength/potential that it is, not as a weakness or a "wound" that needs to be covered up. To me, an "INFP warrior" is someone that has the strength/commitment to give expression or bring into the world what they have within themself. People like our Fi, and our Ne, we just have to remember to feel comfortable and/or courageous enough to actually do so. Note: not everyone likes our Fi and Ne, but those people are probably jackasses anyways ['represses painful memories']
Back to our [potential] relationships with ENFJ's though