I said recently I don't think I find interacting with my own type easy until I know them, and it's hard to get to know them. Largely I imagine because of introversion, and that's the case with all introverts. But I've met a few who buck that trend. I think it's just that we need someone who knows us both to reassure each other that we'll probably get on and that we're nice, or else to have observed each other at a distance first, so that we're not too wary of each other. Otherwise, introverts' exterior and perhaps the INFP exterior in particular can appear slightly inapproachable. I think I look pretty harmless, I even seem to unconsciously project a 'please take care of me' message to people at times, but when I feel wary of someone or their feelings towards me I probably start appearing that way myself, and then elicit more wariness from the other, etc...
The few INFPs I have spoken to in any depth, I've gotten on with very well. I like them a lot, they like me a lot and we have lots to say, more than with other introverted types. There have always been romantic feelings expressed too, to each other or through the medium of someone else again, which might be due to the fact that we happen to have been of the opposite sex and around the same age every time, or else our narcissism.