Please, give me some advice.

Hi everyone! I'm 13 years old girl from Georgia. I'm really big fan of Julie. In my opinion Julie Andrews is the best singer. 3 years ago I try to sing in the high key (operas). And i thought that i have talent, but I wasn't sure. Next I listen my singing to some of my classmate, and they liked it. but actually i'm shame. please tell me what to do to overcome shame (sorry for my bed English. I hope you understand it :D )