Why doesn't any race of guys like black girls?

Why doesn't any race of guys like black girls? I'm a black girl and i think i am pretty and have confidence...whatever. But I swear being a young black girl and dating now is so hard. Guys even black guys make comments all the time about how they prefer white or Latina women and i can not figure out why. Is it seriously about the hair and skin color only? Everyone wants to put black women down and make us feel so bad about ourselves and sometimes its hard not too. I can't just say screw black men and go to a white man because alot of white men do not even like black women. I'm 21 and i feel hopeless when it comes to finding love and getting married and having kids. Unless you are a very light black girl or stunningly gorgeous men will look right past you. And i live in a big city...chicago and its that way here so i know it has to be like that in alot of other places. it just makes me so sad for the younger black girls growing up hearing that they are the ugly girls...