Sorry for the unresponsiveness, I've been struggling to sort through what I might be. Not knowing bothers me more than it should.
I've been reading more about the functions and I think I may have committed to Ni as my dominant function prematurely. The more I read the more accurate Ne sounds (though Ni still accounts for a good portion of my information processing), which only leaves two possible Ne-dominant types, neither of which I'd considered. The ENFP portrait sounds strikingly accurate, though I've been more reclusive and unhappy than the profile paints typical ENFPs. Another problem is the development of my Ti; ENFPs typically have very weak Ti, while I consider mine fairly strong, especially between ages 10 and 16; I have a math trophy laying around and received the highest regional score on my 6th grade placement test (not an outstanding achievement, but indicative of my function hierarchy).
As a child I was almost certainly an INTJ--very cold, analytical, (selectively) organized, hermetic, philosophical, sometimes overly dismissive and blunt. I would spend hours holed away scribbling in a notebook or researching areas of interest. I don't know if this is helpful information, just something I think is interesting to note.
I know it doesn't fit the model, but subjectively I feel I alternate between Ne/Fi and Ni/Ti when in the presence of others and alone, respectively. Company takes a very serious toll on my Ti and I find myself falling back on gut feelings, working backwards to support my claim with logic.