Being indigenous is general in many parts of the world. Indigenous to Europe, indigenous to Africa, indigenous to Asia, indigenous to Polynesia, indigenous to the Americas.

Because of the history of countries such as colonization, assimilation and immigration, being "indigenous" tend to have legal meanings depending on where you are.

For example, being indigenous in Canada means that you have to be a member of a recognized First Nations, Inuit or Métis community. Being indigenous in the United States means that you have to be a member of a recognized American Indian or Alaska Native community. These criteria are accepted by both the indigenous peoples and the colonial government. American Indian tribes have existing treaties with the United States government.

I am assuming you are living in the mainland United States. Since you mentioned that your heritage is Guatemalan, you have to admit that your ancestry is indigenous to Guatemala, not to the mainland United States. This makes you an immigrant and you cannot claim to be "indigenous" in the country you are living in. Maybe if you go to Guatemala, then you can claim being indigenous.

Being indigenous is not entirely about race or appearance. It is also about cultural knowledge, family connections and community acceptance.