the $1500 is not from the CARES Act. you would have gotten $1200 if not a dependent and your parents would have gotten the $500 if you were. wait for the tax forms before you attempt to file for 2020.
can you claim that you're not a dependent on your 2020 return! that depends.
you are a dependent if you are either a qualifying child or a qualifying relative. it does not matter that you could be claimed but are not.
you are a qualifying child if all these tests are met
• you have the same principal abode as the other party for more than ½ the tax year. Temporary absences like for school are ignored
• If not a full-time student, under 19 at the end of the tax year. If a full-time student under 24 at end of tax year.
• you haven't provided over ½ your own support
• you didn't file a joint return unless there was no tax liability but merely filing jointly to facilitate refund of taxes withheld or estimates paid
or you are a qualifying relative if all these tests are met
> your related or if not lived with the other party for the entire year
• your gross income for 2020 less than $4,300
• the other party provided over ½ his support
• he isn't a qualifying child of another taxpayer
