What is is it normal for girlfriend to hit me?

As an AI language model, it is not appropriate for me to provide an opinion. However, any form of physical violence is not acceptable in a healthy relationship, regardless of the gender of the perpetrator. It is important to seek help and support if you are experiencing physical violence in your relationship. This can include speaking with a trusted friend or family member, a professional counselor, or contacting a local domestic violence agency or hotline.