my brother is awful and gross but they love him more than me

hi everyone my name is Rinny or Rin im 15 years old and my brother who is 23 is terrible and my parents choose him over me and don’t love me as much as him. Hes beaten me and said the most horrible things to me ever since we were younger but it’s almost like my parents don’t care that he has hurt me. they just say hes a boy and is being playful. i hate it and i hate all of this. as we got older hes begun to say lewd stuff like that my boobs gotten bigger and the insults hurt way more. he doesn’t hit me as much. they love him so much but he doesn’t even have a job anymore but i do and i help with groceries and rent. he doesn’t do anything but play xbox and go to parties and my parents still praise him. i don’t think my parents have ever said i love you to me. i feel lonely a lot and i think my parents resent me for some reason. I have never done anything to upset them i swear. they barely talk to me. what can i do in this situation at this point? anything that can help me? is this an asian thing? my family is japanese but I was the only born here in the united states so i don’t know if that has anything to do with this. i guess this is more of a rant than needing advice this is my first time on reddit and i don’t trust anyone in my life to talk to like this . i probably sound stupid talking to strangers because of that. anyway this will likely be my last time on here