To what extend is someone considered american?

I was born in the U.S. to immigrant parents and moved to Brazil when I was 6. Now, I’m considering returning to the U.S. for university. In Brazil, I’m sometimes seen as "gringo" and other times as just a native due to my ethnic background (brazilians tend to associate americans with very white skintone). I do connect with American culture and have a deeper understanding of it than most Brazilians. Despite this, I still struggle with certain cultural references and experiences, feeling somewhat disconnected from them due to my time in Brazil. I’m curious about how my situation affects my identity as an 'American' and whether I can be truly considered as an American, despite being distanced from some aspects of U.S. culture.