I do understand how difficult it must be in your culture, but at the same time you are an adult and entitled to lead your own life. I suspect that your divorce may have caused you to lose some self-confidence. You don't say much about your father. Would he be able to influence your mother to ease up a little or is he part of the problem too?
I think you need to sit down with your mother and point out that despite your culture, you are a legal adult now and she really can't control your every movement. It may cause a few arguments to begin with, but unless you make a stand now you will turn into a household slave for life. You say that other family members left because they wante to lead their own lives and this has caused problems. Perhaps you should point out to your mother that if she continues like this, she will drive the rest of you away too. Would it be possible for you to go and live with any of your other family members who have already moved away? Meanwhile I suggest you quietly save as much money as you can, away from the control of your family, so that you have some funds to support yourself when you eventually pluck up enough courage to make the move.