What makes a person look european or american?

i honestly just want to know anyone's true opinion..what makes a women look european or american?...i mean besides maybe style or weight,because im of european descent,nothing too unique(italian sicilian,irish,english,scottish) when i worked at a park once/besides the fact that there were europeans who worked there also, every single day people would ask me where i was from,for about a month all my co-workers didn't even try to talk to me because they thought i was bulgarian or something and didn't speak english.i've gotten swedish,russian,crotian,exchange student.and appartley people think it's "a look"...im just wondering because all whites are european anyway.