I want to move school but my parents won't let me, any advise?

I started secondary about a year ago now and i have an older brother and cousin there. My brother's always mean towards me, in and out of school. My Cousin is popular in his year and him and his friends practally bully me. My cousin loved me before he met those friends, They either don't notice or they don't care. My cousin always chats sh!t behind my back, like saying I snaked to his mum that he's going out with a girl, my head is big, I asked one of his friends out, i complain a lot, lie a lot, when it's all false. Even every time I go to school it is so awkward between me and him and his friends. They always whisper about me and stare at me every time I walk past. It makes me feel so uncomfortable.

I feel like I don't fit in the school, I use to be popular in my other school now I'm one of those people who all popular people don't care about when they bully you.

A few of the friends I have always stab me in my back and try to get my nicer friends to stab me in the back.

Right now, my head of year thinks im a bully.because of one self-caring, masquerading friend made up fake sh!t saying, I called her parents b!tches, I pushed her in a class dance routine and that I wrote something about her that I still don't know up to this day.

I find it so difficult to cope with my school. I know going to school is for learning but how am I suppose to focus when it's an inconvenience for me?

My question is, how can I persuade my parents for me to transfer school?