#1. Yes you have to amend if you filed and it was Accepted or you mailed it. Wait for the original return to process and you get the first refund.
#2 Yes your parents can (whether they do or not) claim you as a dependent. If they try to claim you their efile should reject and they will have to print and mail their return this year.
#3 Did you get a W2 or 1099NEC for your income? You don't have to file if you only got W2 under 12,400 except to get back any withholding taken out. If you got a 1099NEC or 1099Misc you fo have to file.
