Get a passport. Travel. Learn another language. It's not a female name in other parts of the world. 
Um OK.
"Andrea is a given name which is common worldwide for both males and females, cognate to Andreas, Andrej and Andrew.
In the year 2006, it was the third most popular name in Italy with 3.1% of newborns.[1] It is part of the Italian male names ending in a, some others being Elia (Elias), Enea (Aeneas), Luca (Lucas), Mattia (Matthias), Nicola (Nicholas), Tobia (Tobias). In recent and past times, it has also been used on occasion as a female name in Italy and in Spain, where it is considered the legitimate feminine form of Andrés/Andreo/Andreu (Andrew).[citation needed] Outside of Italy, the name is generally considered a female name."