I put a 30$ Itunes gift card on my account but it won't let me use it

Everytime I try to buy something it wants a credit card but I'm only 16 and I don't have one

Is ths the first time that you've tried to download something from the iTunes store, and if it is how did you create the account ? Unless the instructions on this page are followed when creating an account : http://support.apple.com/kb/HT2534
then credit card details will need to be entered before the account can be used to download any item from the store.
If you are being prompted to review the account then you could see if this post by mountaingoatgirl lets you do so without needing to enter credit card details : https://discussions.apple.com/message/24303054
If it doesn't then you could try contacting iTunes Support and see if they can help : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page

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