One grade that isn't quite what you hoped does not define your entire academic status. It happens. If you did your best, then accept it, then let it go. We all have certain classes we excel in as well as areas we don't do so great in. My college GPA was 3.75, and believe me, I got a few grades I wasn't proud of from time to time. But I didn't let it get me down because I knew I did my best. Just learn from it, study even more, and you will pick right back up.