I think we can all understand that it was a blow to your psyche. Understandable. Now, you have to find a way through this and get motivated towards your next level of playing. May I suggest that you look at this from another perspective. Forget what happened...and certainly don't think of this as a set back of any kind. It is actually a good opportunity for you. With the other kid in the lead chair - etc, the pressure is off for you. No worries about how you are going to manage range, etc. Let this other guy worry about that stuff now. YOU, on the other hand, can focus your energies in the practice room - with the intention of just simply working on playing trumpet and NOT as part of a competition against anyone. This is especially true while you still have those braces. Most likely, you are going to have some re-training to do (embouchure-wise) when they come off anyway. Your muscles and fingers can still get a work out in the meantime. Have this positive attitude about your situation and follow the advice of the other posters on this thread. Your situation is a mere blip in your life. This is your opportunity to step back and re-focus your efforts in a positive manner. What a great opportunity you have!! You will gain much and look back on this as your turning point.