Personally, I think you need to talk to a therapist about this. I don't think we're qualified to advise you on this. I think there must be some underlying reason why you at times think it's disgusting and at other times you become sexually aroused by it.
There is NOTHING WRONG with inter-racial dating! You would be committing NO sin by dating a black, hispanic, asian, indian, or whatever other race there is. Nothing is wrong with it. We are ALL children of GOD. So what makes us different?? NOTHING. We are NOT different! We all BLEED RED. We don't bleed black, yellow, brown, etc. It's all RED.
So what is so disgusting? Have you ever been able to figure that out, or is it just a "feeling" that makes no sense?
Get some therapy for this my friend. I don't think you're going to find out here, but I might be wrong. God bless & please take care. Hugs, Lee