[monologue]

Would I be (Catalan) considered some "mexican"? And some Portuguese?

Having seen your pictures, I would say that on appearances alone, you could pass for a local white person. Actually you look vaguely like my youngest sister.

However, if you spoke English with a Spanish-sounding accent, or had a Spanish-sounding name, then yes you might be confused for Mexican, or by a more "knowledgeable" person, for a more Euro mixed nationality like Argentine.

What is absolutely certain is that no average person would hear your speech or read your name, and have it occur to them that you were Catalan. The only ethnic group in Spain that an average American is aware of is Basque, since they made the news with their separatist and terrorist activities. However, having heard of them, or seen their masked faces on TV, does not mean they would know how to recognize their appearance, speech, accent, names, etc.

When you told them you were Catalan, at least half of people would ask "Where's that?", "Is that in Europe?", "Is that in South America?", etc.

Yes, something similar would happen to Portuguese, at least away from places like Boston where there's a Portuguese diaspora. The difference being that average Americans have at least heard of Portugal. So they wouldn't get the stupid questions after they said they were Portuguese.