Yes, you can amend that return and should as you will be allowed a larger deduction and owe less taxes.
First,
I would wait until your return has been accepted.
Then you will need to
prepare an amendment to select that you cannot be claimed as a dependent and are not being claimed. The amendment forms will not be available
until the Form 1040-X is finalized (mid-March).
The IRS does not accept e-filed amendments so you would
need to print out and send in that amendment.
The directions for filing an amendment will be here once
the Form 1040-X is finalized.
https://ttlc.intuit.com/replies/3288565
