What is is it normal for a girlfriend to hit me?

No, it is not normal or acceptable for a girlfriend to hit her partner. Physical violence in any form, whether from a romantic partner or not, is considered a form of abuse and should never be tolerated. It is important to seek help and support if you are in a relationship where you are being physically harmed. You can reach out to local domestic violence hotlines or organizations for resources and guidance on how to safely leave the relationship. Remember, you deserve to be treated with respect and kindness at all times.