You are probably not eligible for stimulus payments if you had no income in 2020 and were not age 17 or younger at the end of 2020.
If you have no income, you are probably a dependent of your parents and should not file a tax return just to claim the stimulus. The IRS is watching for people who should be dependents but are filing to claim the stimulus.
Qualifying children for the stimulus are kids under age 17 at the end of 2020. If you turned 18 during 2020, your parents would not be entitled to receive payments for you on their income tax return.