Unless your accademic visa to be in this country as a student has expiered technicaly you don't HAVE to go back to Hong Kong. Talk with your friends from college, the college dorm people and maybe you can instead of living with your brother live in a college dorm. There are many out of country but in this country as students living in college dorms getting funded by financial aid grants and schollorships. This country also has churches, missions, crisis centers, and shelters that help and give "sanctuary" to people from other countries that are here to attend school and colleges.