Such questions are normal. It is important to remember that you are the victim of a crime, and not responsible in any way for the crime. It does not mean that you are homosexual if you have always been heterosexual. The assault does not mean that you lack masculinity. You are not at fault.
White women are more likely to be raped by black men than by white men.
If you're confused or frightened by something that happened, talk with a friend or a rape crisis counselor. It's normal to feel confusion, anger, guilt, and other strong emotions after a sexual assault.