Hey, math major and tutor here. Came here to suggest dyscalculia, see others beat me to it lol.

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So I'd look into that. But since I don't know you (or how dyscalculia works) well, it could be something else, too. I don't know.

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Personally, I think most education systems/brands do a very bad job of teaching math. Math is logical and structured and things have reasons for them, but how it is often taught is "do this just because." When I was a kid, I was good at math, but I spent a disproportionate amount of time on it because it took a lot of time for me to really grasp what is going on, and *why* I should do it -- and I even had a good curriculum. How math is taught, even through calculus, is formulas and computations that any computer could do really -- but the much more interesting part of math is the why, not the how.

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A good rule of thumb, as someone else mentioned, is reread everything a couple times, every couple paragraphs -- it's a lot different than just reading a novel. Hopefully you can figure out what the underlying problem is, good luck!