With the awards you've received, I would also have your coaches write a reference letter for you. From what I know of University sports, what you study is not important. If you are a star athlete, your chances of getting a scholarship are good. As far as your grades go, they may not be important. Again, if you are a star athlete, in the US, your athletic abilities are more important than your grades. Not at all universities though. I do know certain universities who have high academic admissions requirements, will still require their athletes to have good grades. In general, if they really want you, they don't care that you are an average student. On that note, I would also say that you need to be able to pass your classes. Passing is a C (maybe C-). There is no grade of E in the US. Just A - D, then F.
Do not give up on your dreams.