Bball question that needs answers?

Alright... I work 24/7 on my game and shoot 500 shots a day at game speed and game spots. I hit shots in practice when we scrimmage. Coach knows i can shoot, but for some reason, in the games, i cant hit a single jump shot even if im open. He says "Will, once the lights go on and there's fans in the stands, you cant do nothin". The thing is i dont get nervous and i dont feel nervous or anything. Im confident, but i get frustrated when i cant hit shots in the games. Any advice for this problem