I am 51 years old. My check comes from Social Security disability I believe. I'm not old enough to retire as far as I know.

I am sorry?? What did you apply for, if you applied for disability, had doctor visits, provided SS with tons of medical information,

It would appear to be, but only you know what forms you submitted, and what info you provided the SS department

And in this post you seem to know what you have https://www.askmehelpdesk.com/taxes/have-disability-income-custody-12-year-old-grandson-can-file-taxes-435016.html