Don’t be so hard on yourself Carly, even those of us who don’t have reasons for impaired learning tend to find out areas of interest and don’t take in much of the subjects outside of that.
I also have ADHD and I was diagnosed later in life. It was interesting to discover that might be the reasons why I don’t have an understanding for anything number related but love words. It’s a form of hypofocus and I’m sure you know more about topics others don’t!