Mental harassment

I am 25 years old. I have almost no friends. My family is hell for me. Currently I am not in a situation to put my words in a proper way to elaborate my mental state. My mother is mentally torturing me, since my teenager. Well I think , it has been since I was a teenage as I started realising the situation since then only.I have a younger sister who has an equal role as my mother for me being so depressed today. They keep on spying me as if I am a criminal. They all time try to assassinate my character before my father. Whenever I am home, I manage to make or get my food by myself. They can't see me eating, surviving or even existing. It might seem as a normal sister fight but it is not. My mother treats me like her step daughter and does very cheap things to me. My father treats both me and my sister equal but my sister has problem with me and she can't see me living so she supports mama in doing her shit to me. I am literally thinking of committing suicide and this is not the first time striking to my mind. Please suggest me something. Can I take legal help for this? I am today not on afraid of my family except my father but also from self.