If the parent gave you up at birth, but no legal actions were taken, does this give the caretaker any say?

I'm trying to complete my last year of college but my mother won't give me her tax information and my father is nowhere to be found. My great aunt has raised me since I was two days old but hasn't taken any legal actions to stabilize the situation because she didn't want to make it hard on me and wanted to allow my parents the chance to be in my life! She wants to try to help me get in school but we aren't sure if I can use her information even though all of my ties are under her household! Is there any type of law that allows her true custody of me after so many years?