I'm sorry you are experiencing this.
I agree with lenvegas. This is definitely emotional and verbal abuse.
I know how you are feeling. My older brother has always been emotionally abusive, arrogant towards me. It escalated recently when he had a few drinks and physically assaulted me. My parents didn't really care he did this to me. I have very little contact with them.
I would say take a good long break from your family and try to move in with your fiancé asap. Surrounds yourself with good, loving, supportive people.
Please keep us updated.