'Personal exemption' in the context of the 2018 tax return indicates whether you are being claimed as a dependent on another return. Prior to the 2018 return, there was actual a tax benefit for claiming a personal exemption.
If you are being claimed as a dependent on your parents' return, then you need to indicate this on your own return or it will be rejected. You can still file a return if you need to report income. Whether or not you get a refund will depend on what you are reporting on your return.
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