Improving Your Essays

I work hard in school, but I have a lot of trouble getting the kinds of grades that I want to get. A big problem, I think, is my writing. I’m not good at writing. However, I must write a lot of essays in school, so I get bad grades on those. When the professors read my work, I think they think I’m dumb, but I’m not! I am just bad at writing. How can I make my writing better so that I do better in school?