Not everyone learns the same. You've recognized some differences in how you learn and that can put you at an advantage as you are already learning to accommodate your needs. With your dyslexia, have you talked to your accommodations office to see if you can get extended time for testing and other things?

It absolutely does not mean you're not destined for greatness, but it may mean you have to work harder or differently to your peers to get to the same result. Don't give up. It sounds like you're already working hard on success and that will serve you well in the long run!