my brain is doing that thing where it can’t comprehend that English speakers around me don’t understand what I’m saying
It’s funny you mention this, because I’ve definitely had this with hiragana and katakana where I have a second when showing something to someone when I am appalled that my mother or friend or whoever can’t read it before I realize that of course they can’t they’ve never studied Japanese.
All that to say that it does eventually get internalized to the point that it no longer feels like a second language anymore.
(Grammar, vocab and stuff is another story of course, but that’s already been discussed).