My mother and younger brother blackmail me and also torcher someone

Hi, This is Deepak..i need a suggestion from legally.....My self deepak kumar.. I'm working in pvt sector bank and staying with my mother and my younger brother ...They are blackmailing me if I'll not do whatever they want...they go to my one the friend's home and abusing very badly...this is heppening with a very long time but today they are crossing his limit and i went for evening walk because of till yesterday night i didn't go anywhere even outside my room...from yesterday night i didn't drink a glass of water.. I don't want to go to police because of what will reputation of my family, brother's job, mummy is not well by helath..... that's why i didn't complain....but today i went outside for walk and my brother and mother went my friend's house...not entering her house because of they call to home for know that where i am..... So give me the reply as soon as possible....if i left my house..they will go and torcher and abbusing her ...but my friend is innocent in that, she has a single mother and have two small kids....... I am not weak person, I'm 29yrs old and i can give reply very badly but i don't want to do.