If you still consider yourself a dependent of your parents, you should use that address (your parents) as your mailing address.
Living away from home to go to school can still count as time at home if the student intends to return home once school is finished.
There are other factors to consider as well, such as if your parent provide for your health coverage and other expenses.
Click on the links below for more detailed information about who should be claimed as a dependent and by whom.
Also, be aware that you would be considered a resident of the state where your parents live, so if you worked in a different state while at school, you may owe taxes to your resident state for that earned income.
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HERE for TurboTax help on Rules for Claiming a Dependent on Your Tax Return
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HERE for Tricky Dependent Situations