Yes you are racist. Islam doesnt tell us to marry a guy who has the same colour as you. It tells us that as long as the person is Muslim or is able to convert to Muslim he can get married in a muslim family.
What you said there, came from tradition. Back in the days there were differences between browns also. And there were casts differences and they wouldnt marry each other. Later on there were colour differences, and they are still up on that.