I was born in July 1975

Hello, I do not believe my father to be my real father. I do not look like him and do not act like my siblings. I will tell you some of my heart breaking story that i keep to myself for reasons as to be presenting myself as normal in society. I grew up with two sisters. My mother developed skitzophrenia when I was 5yrs old. My supposed father that i do not look like was never around for us and when he did come home he beat me and my sister for small things he would see. I couldnt understand why my mom was in a fog at the age of 5yrs old. My father always took his rage out on me mostly. My older sister was withdrawn and would not communicate with me and often stayed in her room. I would entertain myself in my room as a child. I would make food for me and my mom which would always be in bed in her room. I am ashamed as once i slapped her when i was 7yrs old to snap her out of it after my father beat me. She did not respond to this. My father had a attachment for my older sister and let her do pretty much anything and i never understood this. He would limit me from healthy escapism with my friends telling me i have chores to do. My mom started taking meds that helped her to be able to communicate somewhat. She told me she saw a man named peter when my dad was in the military and this was before i was born. As time went on my second sister was born. I cared for her. Unfortunately heartbreak happend at the school when i found a lewd note from my supposed father saying sexual comments to me. I felt i had gone through too much and i was breaking down at 13yrs old. I left to live with my mom in a one bedroom apartment she had and he told my sisters to tell me he would disown me. i didnt care. At that time my parents were divorced. As time went on both him and my younger sister slowly talked with me again but they act as though i am invisible to them now. I was in a abusive relationship i left after 10yrs. I lived with my mom and sister again to reconnect. My sister was never home so i spent time with my mom that has a mentality of a child. I would entertain her, i would buy her books and take her out and watch movies with her. My sister now is moving out to leave us for her bf, I cannot afford the place by myself and she wants her deposit back. She has no feeling about us and took a tv in the livingroom back so i had to get one for my poor mom. Well my mom has somewhere to go, my older sister has skitzophrenia and lives with my aunt and my little one is like my dad non existant in my life and both do not care if i call them, they never have time to talk with me and brush me off. I am alone, dealing with this, trying to finish school i went back to, and working a dead end job. I am a good person and many people i meet say i am pleasant and nice. I always lie about my family saying they are great and life is great. Now i confess to you that i feel down and you dont know me so i suppose its okay to tell someone and also wonder if my father is really my father till this day? I love british movies, love nature, always give advice to others and motivate them in their own lives so why do i feel so low in mine.... Thoughts? Comments? Can anyone just talk to me from parent to kid and tell me if i am doing right in my life and if my beliefs are justified. Maybe this is embaressing to say any of this :(