Out of control 15 year old?

so this is weird but im gunna write about myself. about 1 month ago i got suspended because i got caught with marijuana at school, i got a 4 day suspension. my rents hated me for a while but now we started too get back on track but tonight i called my mum a ******** bitc*. i didnt mean too but she wanted too take my phone and read my messages. about 2 years ago, i was nice, illtelligent, shy girl now i get in trouble all the time, both at school and at home. i smoke cigarettes, but i quit i think.. i really want too change, im failing at school and i lost most of my friends. i told my mum i wanted too move schools so i can have a fresh start with new friends but she said no. i hate myself because of what i have become. i know smoking is absolutely stupid so please dont say im an idiot for doing it. i want too change so much, i cry at night sometimes. i think i changed because my whole life ive been bullied, i had really bad acne on my face, and people always made fun of me. but now its all gone, apparently im the prettiest girl in school and all the boys want me now. i tried too kill myself 3 times in my life because of this. my parents just dont know how i feel. please help.