What race should I put on my college application?

Hey everyone! So I'm 1/4 Native American, and 3/4 Indian (my grandma was Native American). Am I allowed to put that I am Native American even if I'm only 1/4 Native American and I don't exactly look like one? I look like I'm a full Indian even though I'm 25% Native American. I want to put Native American because I know I'll get some Affirmative Action benefits, whereas if I put Asian, than I won't get any benefits and might be discriminated against in the admissions process. What should i do? Am I justified in putting Native American?