In the book "American Born Chinese" by Gene Luen Yang, a Chinese boy from San Francisco named Jin Wang moves and transfers to Mayflower Elementary School. He finds it hard to fit in to his new community because of his ethnic differences. All the other kids are very American and isolate him, so he associates his loneliness with his culture. However, when he meets another Asian kid named Wei Chen, he feels a little less lonely and relieved that he finally has a real friend. But even after all of this, he is still obsessed with being American. Finally, he goes on a date with a beautiful, typical American girl that he has been desperately trying to get noticed by for a very long time. But he still seems unsatisfied and uncomfortable with his culture.
Jin Wang never really fitted in with anyone in school. The only difference between him and the other kids is he is Chinese and everyone else is American. So, Jin Wang assumes that the reason why he doesn't fit in is because he is Asian. He becomes ashamed of his culture and tries as hard as he can to become more American.  He tries to blame his loneliness on anything but himself, rather than seeing a problem with himself he sees a problem with society and they way people view him. He is clearly very insecure and wants to be accepted. But he thinks the only way he can fit in is to be American. So he insults his one friend when he does Asian things. For example, on page 89, Jin Wang insults Wei Chen for being Asian in America. "This isn't Taian, you doof! Stop acting like such an F.O.B (Fresh off the boat)!"
When Jin Wang gets an American girl named Amelia that he's drooled over countless times in class, he still isn't content with his life because an American boy named Danny who already knows Amelia seems so much more perfect than him. He doesn't want to be similar to Danny, he wants to exactly like Danny. He wants to be Danny because he is the perfect all American boy who has plenty of friends, plays sports, and is pretty popular. Of all of these characteristics, Jin Wang posses none. He can't see that he should just try to be more out going and meet new people, he blames his loneliness on something that can't change. He has been convinced that his own culture is less superior to American culture.
In conclusion, Jin Wang is not an unpopular loser. He makes himself an unpopular loser. He isolates himself and never talks to his peers because he is afraid of rejection. He doesn't want to believe there is anything wrong with him that he can change. So, he blames his unpopularity on his race and assumes his  other classmates will judge him with unfair stereotypes regarding his ethnicity.