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Sorry to hear. Depending on the country you live, your mother is probably breaking laws and will be in trouble if she keeps you in that belt against your will. That gives you excellent leverage in a discussion. I recommend you have a calm and grown up conversation about this situation with her, politely alluding to the danger your family faces if your predicament becomes public. I can offer a "practice discussion" by text to prepare you, if you want. Your first goal could be to negotiate better rules like regular breaks for you.