As someone who is both dyslexic and ADHD, I think you should get it checked out. If you do have a learning disorder, certain accommodations can be made by your teachers that might be a big help (e.g. being able to record lectures). There are strategies and techniques that you can learn that should help as well. I’m an avid reader myself, but it takes me much longer than other people. Whenever there’s text in a movie, it almost always disappears before I finish reading it.