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.
