Is it normal to be afraid or worried to go to a black person's house?

Are you implying that IIN members aren't "real people"?

Inform your parents of your quandry. Given your attitude, I'm sure they'll be extremely concerned about you picking up some deadly disease or getting raped or murdered if you visit her house, and they'll want to do everything possible to protect their prescious little princess. Since she'll have to visit your place, suggest to your parents that they remove anything of value from the house, install security cameras covering every room, and hire at least two armed security guards to shadow her while she's on your property. Alert your local police about the highly hazardous situation, have your emergency number on speed-dial on your phone, and keep it in your hand at all times. Have a locksmith lined up to replace all the locks once she's gone.