My bank won't let me cash a check?

They say because I'm a minor and my brother is the signer on the account, I can't cash a check because "my account is not set up that way." MY social security number is on they account, and previously, they had no problem letting me cash checks. I also think that they made me sign the papers.... show more They say because I'm a minor and my brother is the signer on the account, I can't cash a check because "my account is not set up that way." MY social security number is on they account, and previously, they had no problem letting me cash checks. I also think that they made me sign the papers. I'm 13, going on 14, and my bank is US Bank.
Update: REAL ANSWERS PLEASE.
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