Work harder, practice more, let your trumpet do the talking and kick his butt. When you win then tell him he better man up and hit the shed or get used to being second banana the rest of his life.
Your high school days are just a rehearsal for the rest of your life. At your 20yr reunion he may be an under employed bitter schlub and you may be a trumpet player in symphony orchestra.
The habits you have now predict the person you will become with amazing accuracy!