Yes, Its normal, during puberty, you just get horny. Personaly, I would utilize the erection, and wank it, that will make it go down (after a while tho) and, If you have the guts, on your band trip if every one is boys, then suggest a circle jerk. I had the balls to suggest one at camp, and everyone fell silent and kinda looked at me wierd. But the camp counselor was all like "Thats a great idea, I've always wanted to!" so after the jerk, everyone forgot it and it became a normal cycle before bed. It also turned into a game, really, to see who could cum first, or who could shoot farthest... ah, the good days. well anyway if you have the courage to ask that, that is.
HOPE I'VE HELPED