my dream i'm only thirteen what do you think??

i really wanna be a singer when i grow up and i haven't changed my mind since i was like nine and i'll try not to brag but i really do have a great voice aspecially for that song have you ever by brandy anyways the problem is that i'm afraid to sing in front of people unless it's like my best friend or my step mom or my real mom otherwiese i'm afraid does anyone have advice cause if you do please tell me or else i don't know what to do or my dream won't come true please help!!!!!!!!!!