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You could go to court and request emancipation. For the state to emancipate you; however, you need to prove to them that you can care for yourself. In Kansas, if you take someone with you that is 21, you can file for emancipation by filing a petition stating your age, that you have lived in Kansas for at least a year and giving the reasons why you want to be recognized as an adult. Here is a link that may help further by providing the exact language regarding emancipation of a minor in your state.
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