Embarrassed myself today at school; How will I cope with the shame?

Okay,so at school we had a guitar showcase and I came in about 15 minutes late due to some car trouble. When I came in (it was to see My Friend) she was just getting ready to start. It was in a small room with about 30-40 people in it and I hit my boot on the side of the door and it made a really loud *SHINGG* sound. I was totally humiliated and everyone snickered at me. On top of that my crush was there. How will I ever show my face in school again? I'm a high school junior and I'm just so clumsy and awkward I can't stand it.