My teacher picks on me all the time!!?

so i have just started my a level (i live in England btw) and one of my subjects is ICT so me my two closest friends are in there so we would work and chat last year was different as the teacher would be more laid back but we all still did all our work and came out with 3 A's which is excellent but this year its different as we have a new teacher whose Malaysian nothing wrong with that but she does like her music she plays it full blast all the time to i can't work. But so my friends talk and work so now they have split us up. and i never got moved or anything in high school and but she treats me differently to the other two. she sat them both with another student and separated me from evyone i wear soemthing differnet and so does my bestie and miss is like nice to her and then moans at me to tae my hat offwhen is non uniform i coughed onceand she was like wt did u say i coughed thats all i did nothing else. But she always picks on me and i don't know y i mean i don't say anything really in cl now except is i ask my bestie how to do something shes like maybe we should move u further away i now hate the lessons and don't know wt to do. Even my friends say she does pick on you a lot.