become a singer

well i love to sing, it mean alot to me!! i take lessons once a week! my parents r 100% supportive but wish i took my voice further! I would but im not confident enough, i hate to sing infront of loads of people on my own, im not so bad in groups. The only people i can properly sing infront of are my closest friends, family and my singing teacher! im in the same situation when i have to speak on my own infront of loads of people, my voice goes wobbly, i freeze n go shy!! But i rele wanna become a famous singer! How can i become more confident with singing infront of people??