My singing

When I sing I have a shaky voice sometimes,, I think I sound like I have a cold. How could I change it?

the change in your voice will come with experience, I myself sing and have found that the more I perform infront of people, the better I become.
its common with all people who find it hard to sing, but when you find the confidence within yourself, the shakyness of your voice will begin to fade.
just practice, practice, practice. and if you really love singing, perform at some school concerts or town fetes?
perform with your voice, not your head.
because its the thought that your going to screw up thats holding you back,

hope this helps,
-georgiaarose