step mum missery

my step-mum has really been pissin me off l8ly. She has been livin wid me since i was 5 cause my mum died wen i was 4 and l8ly she has been pissin me right off. just by tellin me wat 2 do all the time and givin me no freedom. im in year 7 so i do deserve FREEDOM! I nva waged b4 in fear she would find out n my teacher called my step mum cause i said "Jed is gunna piss himself!" Thats all i said and she grounded me 4 22 WEEKS!!!!!!!!!!! I hate her and she obviously hates me 2! DAD LOVES HER! (sob) wat can i do?