Eye contact I feel is an interesting topic!
Curiously, when I was in my teens and early adulthood I never managed to maintain eye contact with a person I spoke to (no matter whether complete stranger or confidante!)
That behaviour was pinpointed by some people who were very close to me as kind of odd, if not even irritating. Of course I, myself, could not really explain why I couldn't do the whole eye contact thing.
The “problem“ (that is up to debate!! ;-D), however, vanished by itself as I grew older, why exactly I don't know and would need to reflect on.
Nowadays I am able and willing to keep eye contact with someone up to the point where it seems to become too intense for the person I speak to so I even have to be careful and considerate of the other.
For me, keeping eye contact while talking to someone is important because:
*you acknowledge the presence of the person you are talking to thus making conversing easier by making them feel at ease
*you convey that YOU are actually meaning to converse (opposed to for instance at work you may not be looking at a colleague who you are still talking to while fiddling with something else at the same time - for me that would be a subtle way of telling “I am talking to you because you seem to need it right now, but look I am also VERY busy and distracted right now.“)
*mutual eye contact conveys authenticity and trust
*also, if bringing across a point your eye contact will instantly raise your credibility factor which can be worth it at work (see basic rhetorics)
*you can make use of NLP (wikipedia it ;-)) if you look into someones eyes while talking to gauge whether they are telling the truth or if the are making things up as they go - but I only ever do that at work
Anyway, I do feel eye contact can be a typical INFP “issue“ but if you are feeling down about your inability to make and keep eye contact just give it a little time and training. I feel this side of conversing comes naturally over the years as an INFP matures and grows older, more accustomed to the world.
Until then a little tip: instead of looking someone in the eyes simply look at the tip of their nose. The person will feel as though you are looking in their eyes and it is MUCH easier to do and maintain! It's a fine way to train yourself, too. Simply alternate your eye contact between their eyes and to the tip of their nose when you have exhausted yourself, then back up to eyes again after a while.