Most Helpful Girl
Just keep doing your thing. Ask the teach for help. That's what I do. I sing and get principle roles in my schools musicals and I practice like crazy. There is almost never a day where I DON'T sing. Do exercises and ask the teacher what you can do to improve. That's the only advice I have. I know what it's like to feel embarrassed, but I worked hard to build my confidence by doing the things I suggested above.