I am a good singer but how do i get noticed?

What you could do is record a Demo CD and send it away to various record companies. If you do not want to do that, put yourself of Youtube x

you could try talent shows at school or a special event

go busking Famous people started that way...go to pubs sing there or weddings birthdays party's ...

I would try your hand at songwriting, people tend to pay more attention to singers who are original with their material. Also, you could try entering some kareoke competitions, there used to be one in a local in Dublin near where I lived, and Louis Walsh was always in there looking out for new talent. You can also try sending demos in to different and small record companies, or even try getting a band together and getting some good local gigs. You could also join a musical theatre perhaps, thats what I did, I love it!