To this date, the IRS has not reported whether it will 'correct' stimulus payments.
A person may be claimed as a dependent if the person meets all of the tests for either a qualifying child or a qualifying relative.
IRS publication 501 Table 5 page 11 outlines the requirements.
You may attempt to amend your Federal 1040 tax return if you believe that you did not qualify as a dependent.
Please be aware that whoever is claiming you as a dependent will also have to amend their Federal 1040 tax return.
Please see this TurboTax Help.
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I am 100% not able to be claimed as a dependent as I am 21 live on my own, and my parents have not claimed me as a dependent since I was 18. I went ahead and sent in an amended federal 1040x, so hopefully it will do the trick but I was told it can take 12-16 weeks to be accepted, so I may have to wait until next years tax season and hopefully get the stimulus check then.