You are not an international student.
If you identify as part-Brazilian, feel free to mark yourself as Hispanic/Latino if you so choose. FWIW, the National Hispanic Recognition Program (NHRP), defines Hispanic/Latino as having ancestors from one or more of the following countries: Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Puerto Rico, Spain, Uruguay, or Venezuela.
https://www.collegeboard.org/psat-nmsqt/scores/using-results/scholarships-recognition/national-hispanic-recognition-program
Further info:
http://talk.collegeconfidential.com/hispanic-students/641650-hispanic-latino-defined-aka-am-i-hispanic-p1.html