Moving Out Of Parents House Without There Permission Because They Wants Me Marry

I am 21 years old girl. I leave with my family. They are not allowing me to move out. I want to do job and get out of there house. after completing my 12 I requested that I want to study in another city. they refused for it. after finding that I have boyfriend (muslim) now they are not allowing me to get out from there house. they wanted me to get marry. they always emotionally blackmails me. they threatens me that they will kill my bf and harm themselves. I can't handle anymore . I don't want to marry at this time. they say we will get you Marry and you will not able to do anything. The main prblm is that my father is also an advocate. so he has many contacts and my family also has many contacts I want to legally leave there house and never wanted to look back. they have contacts in police departments also. so no police will help me. I don't have any money too I have very less money. for affording advocate. in such situation what should I do? can I get police protection for me and my bfs family? and can I get some money from my family? please suggest me legal action against them?