I don't know how in-touch with their senses SPs are "supposed" to be. I can be sitting uncomfortably for a long time and won't notice, for example. It would seem that ESxPs are very aware of their environment, but couldn't ISxPs basically live in their dominant function. I'm not at all "in the moment", but that doesn't really help because if an ISFP is very Fi heavy, maybe they can be out of the moment too.From what I understand, ISFPs are more easy going and are less likely to be as openly opinionated as INFPs for some reason. People have suggested SFP for me (and trust me, there's no way I'm ESFP, just not extroverted enough) which would leave me with ISFP...thing is, I relate to what you said about being inside of my own head and often walking places without even being able to tell you even exactly how I got there, although I am in touch with my five senses to a certain degree. I'm also more openly expressive about my opinions - and some of my opinions are pretty strong - and I enjoy theory and excel at literary analysis.
Don't know if this helps.
I also enjoy theory, at least, I think I do . I can't "learn by doing" (I don't learn anything, lol). I am relating this mostly to university, but as an example: in some of my more theoretical (and thankfully, lab-free) chemistry courses other students seem "unwilling" to learn the material, saying "It doesn't relate to the real world". They seem to want to apply it with labs, but I am not like this. Pretty much, I am just fine with things not relating to the real world. But again, that seems to go against SJ more than SP.
Everything helps . Thanks again. Sorry for rambling.