There are different styles of writing. You college essays are not creative writing exercises, they are more persuasive. Think “here’s what you need to know about me that makes me a great addition to your campus” not a writing sample. Not a knock on your writing, just a reminder that different situations require different styles. It’s good to recognize this since in college you will have to tailor your style to the class - just wait until you have a lab course that requires you to write in passive voice.