well, I think you could have been claimed by your parents which means your tax return was completed correctly.
there are a number of test that must be passed for you to be claimed as a dependent. ALL must be passed:
1)Age Test: Under 19 years old (or under 24 and a full-time student) or disabled You pass this one
2)Relationship Test: A bio, step or foster child, or bio, step or half sibling, including their descendants of the taxpayer (meaning your parents) you pass this one
3)Residency Test: Child lived with taxpayer for at least 6 months of the year. since you state your legal address was your parent's home, then there is an arguement that whereever you were living was "temporary" per the IRS definition so you pass this test (if you are living somewhere temporarily, say a college dorm, the IRS sees that as temporarily living away from home, so your permanent home remains your parent's home. If your legal address was your parent;s home and you were temporarily boucing around living with others, your permament home remained your parent's home).
4)Support Test: Child did not provide more than half of their own support - that is a reconcilation of what you paid for versus what your parents paid for. It considere rent/ mortgage, food, utilties, insurance, taxes, insurance, medical costs, etc. It is unlikely you paid more than half and if you didn't pay more than half, you pass this test. the IRS uses the form on page 16 to assess this test https://www.irs.gov/pub/irs-pdf/p501.pdf
Since all 4 tests were passed (and I assume you are a US citizen with a SS card), you COULD BE a dependent of your parents in 2020 and therefore, you submitted you tax return correctly. No need to amend.
Lastly, it doesn't matter whether or not your parents claimed you. Whether they did is always their option, but from your standpoint the question on the tax return was COULD someone claim you - not DID someone claim you. See the difference? And based on what you stated as it pertains to the test I outlined above, your parents COULD have claimed you.
does this make sense?
