Marmotini opted to post in this thread as your posting style makes her's come to mind, and she identifies as SFP. Your communication style has a similar personal focus to it that comes off as intellectual while warmly tactile. If you were NP, your discussion of personal values would probably have been more philosophical principles, and less based off of direct experience. NP communication styles in general tend to be fairly metaphorical: lot of puns and word play, references, and general mucking about with the language. I'm not even entertaining INTJ here because Ni-doms have a different energy all together, and as a rule don't seem to have much trouble self-identifying.
SFP would explain why you think you're a 3. SPs are performers. You seem to have some heavy mental activity going on, though. Lot of thinking and overthinking and mental back and forth that smacks of a head type for sure. It can sometimes be indicative of Ne-usage depending on what's motivating it, but it doesn't appear to be driven by seeing an excess of possibilities so much as it experiencing an excess of self-doubt. 4 is probably in your trifix. 648 or something to that effect.