>>5143902How were you openly gay BEFORE if you can't manage this NOW? Hand the girl a note saying you're gay, ask a friend to say after a conversation about how nice a guy you are, "It's so weird that anon comes off straight when he's actually gay, right?" Make sure they're around a loud mouth (in a room full of wind players, you must have someone like that) and not some introvert so they can repeat it to the others. You could ask a teacher that already knows you're gay to take the girl to the side and say you're gay. Ask them to say, "I've seen you looking at Anon a bit, and I'm sorry to make assumptions, but I also don't want you to get heartbroken. He's gay, you know?" She might even learn on her own by asking people in your year.
Although I criticize you for being too old for to not be able to do this, I couldn't do it myself when I was in a similar position. I dislike myself for having been two years older, yet a decade more cowardly.