How come people think this girl's going to leave me because I'm too ugly for her ?

I'm a 20 year old vietnamese american dude and I had a hard tim finding a girl here in the state so my mother asked my aunt in vietnam to find me a girl who's willing to come to the u.s and marry me. I have scoliosis and I make an low income and no girl here wants me. These people think this girl is going to leave me because I'm too ugly for her because I'm a hunchback. Why do they think that ????