Am I a Foreigner or Not? Story of a Czech/Luxembourgish Student in Brno

Hi, my name is Anna, I am 22 years old, and I am currently living in Brno. I was born and raised in Luxembourg, with a double nationality, Luxembourgish and Czech.
I lived in Luxembourg until my graduation in 2018, however, I visited my relatives and friends in the Czech Republic during my whole life. Living in a bi-lingual household, the language never was an issue whenever I came here.