How to get away from a mother who always doubts my character

I'm 23, female, unmarried, living with my mother, my father is not with us. Im constantly being accused of prostitution and illegal affairs by my mother. I'm not allowed to meet certain people for her doubt that I may have affair with them. If I call someone, she finds out whom I called, reach that person and fight with them by asking why did u call my daughter, what do u want? She don't let me go out alone. She always comes with me everywhere. If she goes out of house, she keeps my cousin or my aunt or someone at home such that I don't go out. I'm completely isolated and she controls every action of mine. What ever I say, she links my character and accuses me. My mother is forcing me for marriage by constantly troubling me of why i dont want to marry and again accusing me of my character. I want to reach some govt official who can help me to take me out of this house safely. I don't want to marry now. Whom caan i reach to get out of this house legally? I can only use internet here.