First off, do not feel excluded or like this has only happened to you...I used to have the same problem! But my director sat me down and convinced me to switch to euphonium. BEST DECISION EVER, and I wish I had done it earlier than my junior year. Obviously it sounds like you really enjoy trumpet, so if that's the case, DON'T STOP! But on the chance that you are looking to "move on up", euphonium might not be a terrible option?!