Did you say you could not be claimed as someone else’s dependent, but it turns out your parent(s) can claim you? Now your parents’ return is being rejected when they e-file, or it will be rejected. That means your parents must print, sign, and mail their return. They can still claim you as a dependent, but they cannot e-file now. Not even if they wait for you to amend, so they should not wait for you to do that.
Your part in fixing this is to wait until your return has been fully processed and you have received you refund. THEN you need to file an amended return, called a 1040X, to change the way you answered that question in My Info about whether you can be claimed as someone else’s dependent.
Wait until your original return has been fully processed before you amend, and make sure you have saved a pdf of the original return before you amend. (If you do not save it as a pdf, the amended return will overwrite the original, and the original will be lost forever)
See this TurboTax support FAQ for amending a tax return -
CURRENT YEAR