True or false cannot be answered without specific numbers which should not be posted to a public forum.
The bottom line is that determining if a person is financially supporting another person is not solely contingent on whether that individual filed a tax return. Your situation needs to take into account household income, not necessarily taxable income.
You are a student with earned income. That alone puts you firmly in the gray area where the true, honest answer regarding whether you are a dependent is "It depends." While this may be frustrating, the bottom line is that if you insist on identifying as a dependent, you cannot receive the Rebate Recovery Credit.
It is for you to determine whether it is legitimate to interpret your financial contribution as providing more than 50% of your support. Your decision should count up all the money coming in from all resources to your household.
