Forced marriage and mental and emotional abuse

I am planning to leave my house and runaway to another city. Though from a good family background I have gone through years of mental abuse by my family. And now they want me to get married despite me being not ready. They have taken away my western clothes, taken away my phone too, practically kept me under house arrest not allowed to meet anyone. I don't want to be married forcefully. My dad is in police and has even threatened to kill me. My question is that if I go missing and police is searching me and if I am found. Is there a legal Way to refuse to go back to parents house. I have made all the arrangements in another city. If I handover a video in which I am stating that I have ran away with my own wish and don't wish to be found will that do ? Though I have provided the number, it isn't working. It's better if anyone who knows what can be done mail me on given id.