I'm afraid to tell my family
What is it about your family that you're afraid of?
I'm not sure how to deal with their threatening demeanor.
Communication is the key to a successful relationship, so sit down and talk to your family about this so that they understand your view. Try to make your feelings known so that you can move on with your life.
Maybe. But I really want to go to big city and fuck off from them.
Running away from your problems is not going to solve them. Simple communication could resolve many issues and I highly recommend you to speak with them.