Teachers! please answer!?

im in grade 9 and ever since i started high school i got loads of detention. like more than 10...for stuff like ditching, leaving school before the school day is over, starting fights, talking during cl after being given several warnings, lol and one time i got 2 weeks worth for cheating on my midterm. my parents always give me hell every time i come home late cause of a detention. they took away my tv and my computer for a bit. right now my punishment for ditching cl is no friends for a month. i dont think they should punish me because i already got punished at school. its so unfair! what do you think? the detentions at my school are 2 hours. they can be 2 hours or 1 hour or a half hour depending on the severity of what i do wrong. i got 2 hours for the rest of the year.