If you've confirmed that you're not on your parents taxes, and you've already tried posting a zero and got rejected. I recommend that you mail your tax return in.
If you select to mail your return TurboTax will print an instruction sheet explaining where to mail the returns.
Completing your Return
Did you have any income in 2019? Even if you were a dependent on your parents' return in 2019, are you sure that your parents did not file a 2019 tax return in YOUR name in addition to their own? Have you asked them?
A lot of parents prepare and file returns for their kids to report their kids' income, in which case the return would be in the name of the kid, even if a dependent. That may or may not apply to you, but mentioning it just in case. Again, ask your parents.