Not true. I have a diagnosed disability not based on my low scores but on my large discrepancies. For some reason large discrepancies can act like ld's.

I feel for you. I had and have very similar problems, not so much in school but in life. I wish I was diagnosed earlier.

And no, it was not caused by reading a lot. I suspect it's the reverse: if reading is your strongest point you end up there. In my case I've spent a lot of time trying to do other things well. Just have little to show for it.

I understand well how it's invalidating for people with problems in the normal range think it's the same as having a disability. It's just that big discrepancies often do function as bona fida disabilities.