You are considered a minor in Mississippi until the age of 21, however, at your age there is not much your parents can do to keep you home. Just remember, if you go, they don't have to let you come back.
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The age of emancipation is 21, but you need to consider all the issues you'll need to take care of in order to survive on your own. Things like, a job, a car, food, shelter, bills, etc. Good Luck.
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