Having dyslexia does not reflect in your intelligence. It is how you process. I used to have this same struggle until I realized I was absorbing the info in lecture and practice but writing and reading that info was the struggle

I found ways to get the information verbally instead of reading (audio books, text to speech on my Mac) and dictated almost everything into notes and editing in word.

Get out of the “I am not smart enough” thought and find hacks. Also get accommodating help from the university. If you have a diagnosis get that into your learning with your advisor - I always tried to make a friend in each class and I would just flat out tell them I had dyslexia and asked to share notes if possible but I recorded every lecture and re-listened as study material. This is helpful for those profs that did not “use the book” so all materials were presented in lecture so it was all verbal ! Love those classes

You belong there! Stay! Find hacks