If I am understanding your question, you feel you checked that you did not provide more than half of your support in 2020. It depends on many factors whether it could make a significant difference.
Here is a way to determine whether you provided more than half of your support. You total up all your expenses and compare it to what you earned from employment, typically money reported on a W-2 or 1099-MISC. If that earned money was at least half your expenses then the answer is Yes.
I do not know all of the particulars about your cost of living situation in 2020, but since you were living at home with your parents, it could be very close as to who is entitled to the dependency exemption. You have to consider whether you paid rent or did they provide free, any college expenses paid by parents etc.
Also, consider whether your parents claimed you and what changing your return will do to their taxes.
To determine the actual amount you can go into your 2020 to prepare an amended return to claim yourself and any other relative deductions. Prepare it just to see the difference you do not half to file it. You will then see what your refund would have been if you filed differently. However, remember this might affect your parents return.
@Charlotte7598
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