There are plenty of times when people have been accused of a crime they didn't commit; your case may not be any different. While you're working with your attorney on a way to fight the charges, it's important to learn about how to defend yourself and reputation. You have a few ways you can answer the charges against you, but the most important fact of a criminal charge is that the prosecutor will need to prove that you're guilty beyond a reasonable doubt. If you can make a jury or judge doubt that you're guilty, then you have a chance to win your case.
The first major defense is innocence. If you can prove that you didn't commit the crime, then you shouldn't have anything to worry about. In the American legal system, you are always presumed innocent until the court can prove otherwise. In order to avoid incriminating yourself, you can also choose to plead the fifth, which means you can stay silent and hear what the prosecutor's claims are.