@charlie444
Look at your form 1040. Underneath the address area is a section titled Standard Deduction. The box Someone can claim you as a dependent should not be checked.
It is unclear at this time, whether filing an amended return, to change that will get you the stimulus check in 2020. If not, you'll get it in 2021.
"In essence, the stimulus check acts as an advance of your 2020 income tax refund. This means when you prepare your 2020 income tax return, there will be a line to include the section 6428 credit. The credit on your 2020 return is subtracted by any amount received as a stimulus check in 2020. If the amount you received as a stimulus check is less than the credit you are due, the difference will be included as part of your 2020 refund. If you have been overpaid by receiving the stimulus check, however, you will not be required to return any excess amount".
