Continuous cruelty of family members(previously physical, currently mental)

I live in Kolkata, in a house which has 4 members- My father, my Mother, my Aunt and myself. Till the age of 18, I was constantly beaten by my father with the passive support of my family members. Even after 18, he has raised his hand quite a few times(the last case being in the month of September, 2021).I'm currently 21 years, 6 months old. My deceased grandfather and grandmother were the ones who looked after my financial needs. Over the past 2 years, my Aunt has supported me financially to a major extent while my father hasn't paid a single penny. My Aunt, on the other hand, has constantly made me aware that she is paying the money and wants constant acknowledgement and servitude in return for the same. My mother is a stereotypical housewife, who doesn't raise her voice against such atrocities. I tried to bear with this by completely separating myself and keeping myself confined for most of the time. As if this was not enough, now, they are spreading lies about misconduct and misbehavior (the confinement and not talking with anyone is the apparent misbehavior) to all my relatives and friends, so that everyone deserts me. I'm currently doing my M.A. but am unable to cope up with such adversaries. The continuing cruelty has reached such a point that I often think of killing myself. I visited a neurologist and he has confirmed that I've suffered from nerve damages. Is there any way that I can stop them from spreading lies about me and let me remain in peace? I don't have any financial aid as of now. Can the court provide me with a lawyer in order to help me fight a case (if one is filed)?