While you may have filed your own taxes, that doesn't guarantee that another tax return wasn't also filed listing you as a dependent. Unfortunately, there isn't a simple way to fix this and the IRS will not provide you with information about another taxpayer's return - even if it is a return on which you are listed as a dependent.
You can file your 2019 tax return to see if this might qualify you for payment later this year, but there is no guarantee that it will work.
Absent that, the last way to receive the payment will be to claim it on your 2020 tax return when you file in 2021. If the IRS determines that you are not eligible for an advance payment there isn't an appeals process other than to claim the credit on your 2020 return.
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