Only good when i’m high

When i'm sober and my coach lets me shoot, my form gets wobbly because im nervous. But when im high i get creative and can hit shots with ease. I'm a "big man" at 6'3 so i need to prove to my coach i can shoot. Obviously i dont get high before every game and practice, i just want to get over this confidence hurdle. If anyone can tell me how to fix this it would be a big help. It's starting to affect my game