Saying you are a full time high school student has no effect on your tax refund or tax due. At the age of 18, you can still be claimed as a qualifying child dependent by your parent(s). If the only income was the Social Security disability benefits, you do not have to file a tax return. If you had any other income like from an after school or summer job, then the SSA1099 and your other income goes on a tax return, which you can file to seek a refund if tax was withheld from your paychecks (box 2 or 17 of your W-2). Not sure why you are saying you will not be claimed--unless your parent does not file a return. Your refund or tax due are not affected by being claimed as a dependent.
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