Do you think it's wrong that I want to breakup with my girlfriend?
That depends, why do you want to break up with your girlfriend?
She is just a bitch
If you no longer are happy with a relationship you should break up. You should be honest and tell the other person how you feel first.
This bitch is awful to me and she gets me really mad.
It seems that you are unhappy in your relationship. If you do not feel that the issues can be worked out. It's okay to respectfully end the relationship.