Chosen people does not mean the cream of the crop. We are chosen to be a holy nation and to be G-d's servants. One of the things required of G-d's chosen people is to follow G-d's rules and laws. One of those rules is to be modest in all our ways. It is not conceited to state the truth. However distorting the truth and stating that we are chosen (i.e. superior) is baseless pride. One can also be arrogant be pretending to be more humble than others . . . p.s. Anyone that is sincere can convert to Judaism.
from the article: Jewish people are just that, people, and far from chosen