Behaviorally, it would be assumed that you "learned" or have been "taught" to view white-skinned persons as bad. Psychodynamically, it would be viewed that something in your childhood happened to cause you to think those things. Perhaps your parents or family were victimized by someone white or something along those lines. You may not even remember it. The object of psychoanalysis is to help you remember what could have happened. Of course any therapy session would be able to get a lot more information out of you about this topic than we can here.
To me, it's obvious that something in your past/childhood happened to help or make you think negatively about white people/girls.
Or perhaps you were already keen to the fact that there is a racial issue and you felt inferior to white skinned blondes and turned aggressive toward your dolls of that type.
Whatever the case was, it does not make you a bad child or person. Not unless you have grown to be that aggressive towards real people of that complexion. Then we'd have criminal issues at hand. But it sounds to me that you possibly grew up in a predominantly Asian community where white people were viewed as enemies. And quite possibly it could have very well been the case that whites were the enemy during some situation(s) or circumstances.
But no, it does not make you a bad person. Children live what they learn.
Edit: to comment on Cassie's post - socioeconomic status plays a huge role in issues of race. Keeping with the statistics I wish Cassie would have mentioned what economic scale that study was done on. It is very interesting but it's important to include the social status in reports like those. Nice post Cassie! :)