My brother always hits me... what do i do?

my brother always punches rli hard in the arm or pinches me and always tries to just hurt me... basically... what i do to not cry or anything is to pretend to be funny and shake it off. so i say to him " yes master, yes master!!" i cant fight back cos he is older than me so i just annoy him by basically worshipping him and pretending i am in love with him. i know it sounds weird but if i did it to you it would annoy you as well, i have my ways :) and if i stop annoying him i know he will just continue hurting me...but anyways. he always threatens to break my arm (he has never doen it) but my arms are covered in bruses. and my parents dont rli care and expect us to take care of it ourselves. once i couldnt take it anymore and locked myself in a room and screamed all the swear words under the sun and trashed the entire room, i stayed there for 4 hours and then i finally came out my brother just kept laughing at me. once i left his phone in the car and he punched me so many times i felt like iw as going to cry. but crying would just make me seem weak.... i just kinda wanna confess this stuff but at the same time i need some help and i want someone to just gimme advice on how to get him to stop! THANKSS XX