"Black people are cursed"?

First off i am black domincan female. I went to bible study with my grandma yesturday and they were discussing how umm cursed caine and turned his skin black and cursed all his descendants. I know it sounds absurd, but i think it could be true. The black community struggles more than any other race within united states that i know of. They have problems with poor neighborhoods, education, crime rates, people consider them unattractive in society because of their skin color (lighter the better). Black community has even divided itself because of skin color. Black women are most single group in united states. Even in africa which is well known for poverty and disease such as hiv. The more i think about it the more i think it may be true. Blacks have always struggled, and have a long history of it . Do you think this curse could be true? I'm really not trying to be ignorant, just want opinions.