Family threatening to kill me if I marry my boyfriend what can I do

dear sir/madam, i am 25yrs old girl, im frm hyd. we are family of 2 sisters and 1 brother excluding parents. sister married and brother un married. i loved same caste candidate, he and his parents are ready to talk with my parents, but my all family members are scolding me 24/7 with abused words. asking me to leave their home with my wearing clothes and leave all my things at home, my brother threatenig me that he will kill me and my lover. can i file a case on all members? if yes which case i can put? if i file case is there anyproblems for me? is any eidence is required to file a case