No, this should negatively affect your eligibility for the stimulus payment.
Since you selected "someone else can claim me as their dependent" on your return, this indicated to the IRS that you couldn't claim yourself on your return, and you were a dependent on someone else's return. And if you’re a dependent of someone else, you’re not eligible for the payment.
So, as you suggest, amending your original return is the way to go.
Please see the TurboTax Help article "How to amend (change or correct) a return you already filed" for instruction on how to amend your previously-filed tax return.
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