Jaded, yes.First, you're most certainly an INFJ. I have interacted with a ton (read: way too many) INFJ's online before and can usually spot one. You're somewhat atypical, but INFJ nonetheless. You seem quite jaded, and that can come across as non-INFJ like.
I'm INTJ, so it's a little different, but if I take a function test, or anything else, very often Si will be my highest score, and Ni will usually be 2nd to 4th. Part of the reason is Ni is made out to be this mystical/spiritual nonsense that is false for what Ni actually is and that I can't relate to. So that does drop the score then. Even so, I relate to Si and Ni a lot. It's very much how my brain processes stuff. Ultimately though Ni fits better as I try super hard to make everything sequential and make sense, that is not the default to me.
A lot of people scoff at Si because of poor stereotypes, but if one gets past that, it's pretty common for Ni doms to relate to it. Much more so if they don't well relate to Se or Ne. For me at least, I really do not relate to Ne at all. Also, do not want. Se I do poorly, but I am quite fond of it in certain contexts .
Thanks for posting.