I'm very glad I read this post, you might find comfort in the fact that I am experiencing very similiar things. I am 17.

After I hit my head, I found calculus, and other advanced science/math courses still quite easy for me, but English is a completely different story. I have a very hard time comprehending what I read, and it is very annoying.

You will improve, don't worry, it just takes time. Just don't isolate yourself at home, which is what I did.