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 yang lalu I try to sing in the high key (operas). And i thought that i have talent, but I wasn't sure. selanjutnya I listen my bernyanyi 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 tempat tidur English. I hope anda understand it :D )