Why always me?

My father had a boxing center, which just opened a year ago. The center was developed with advanced boxing but I had to work as a janitor and always be the last person out of the building because I have to lock all the doors and the main entrance.  My father says if you want to practice for free I have to be working here, no need to pay a fee just to work alone and it makes me feel ostracized by my own father. I have two brothers and they’re  twins, Lee Hong-Gi and Lee Hyun Woo. They being  loved by my mother and father equally and probably I am the last one so I was marginalized. They are given the opportunity to enter any boxing match organized since childhood, and they are active in sports. I have not had the opportunity so because the father said that women do not need to be active because eventually they will get in the kitchen as well as my mom.
“ Why'd you always so rude to me, just like Hyun Woo that always hates me.”

 He wants to be the last and try get rid of me. He will do anything and always accusing me of things I did not do. And all trending fault to me.

 "Why do I have to live in silence and no one was backing up me"

"Why always me?"

"Someone please help me to get rid all of this"