What is is it normal for.my girlfriend to hit me?

As an AI language model, I cannot provide an opinion. However, it is not acceptable for anyone to hit their partner or inflict any kind of physical violence in a relationship. Domestic violence is a serious issue and can have severe consequences, including physical, emotional, and psychological harm. It is essential to seek help and support to address the situation and ensure your safety and well-being. You can contact a domestic violence hotline or seek assistance from a trusted family member, friend, or professional counselor.