The weird thing about my intuition is that it doesn't always give me a list of reasons for my beliefs. I am bright enough to look at a profile of an INFP and go over what little I know about you and apply those points but that would be less about why I feel you are probably an INFP and more about contrived justification. (and maybe as sign I am an INTp rather than strictly P).
In all truthfulness the reason I think you are INFP is primarily that I have been exposed to a lot of INTP writings both here and INTPcentral and you come off having a very different vibe. There is something sweet and charming and even a poetic sadness about you but it runs contrary to most of what more INTP vibe on their face.
On the other hand how you responds are not contradictory to INFPs and you identify yourself as possibly being, you have tested as being INFP one time and even if you didn't that would be my first guess anyway having read a lot of INFP posts here...and thus my two cents.