Can someone write a song for me?

I am 15 years old and I want to make a demo cd. I have tried a lot of times to try and write a song but it never works out. I will give you full credit for writing the song too. I love writing songs but I cant sing for anything. xD; I can write lyrics if that is all your looking for but tunes are harder D: also, just for notice, putting what kind of song or what you want the song to be about can make it more easy to ensure you dont recieve a lot of akward answers. ^^ I hope none