You need to amend your tax year 2020 return for sure to add the missing Robinhood income 1099 document. Since you indicate you were officially moved out and on your own 100% for 2020 you can include the school 2020 form 1098-T on your return.
Tax year 2019, appears to be a transition year. If you lived with your parents at least 1/2 the year (temporary absence due to attending school is time living with them) and you did not provide more than 1/2 of your own support and you were a full-time student for any part of 5 months of the year, you would be a dependent on your parent's return for tax year 2019. You should amend your return to indicate you could be claimed as a dependent. Your parents would also amend their 2019 return to include the form 1098-T on their return.
However, if you fail any one of those tests above you would not be a dependent. You should amend your 2019 return to include the 2019 1098-T on your return.
It appears you were a dependent for tax year 2018 and both you and your parents filed that way. If your parents did not include the form 2018 1098-T on their 2018 tax return they should amend to include it.
Additionally, since you were not a dependent for tax year 2020 you also would need/want to review the Recovery Rebate Credit questions and if you did not receive stimulus payments for rounds one and/or two you would be eligible for that credit as well.
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