My parents took my car away and i want it back. bc they alway ground me over stuped ****!!!?

i am 19. and i have a curf of 12 on week nights and 130 on weekends. all my friends are older. and dont even have curfs. now i dont mind being home then. yea it bugs me but i can deal. its there house right? well my parents always yell at me when i am 5 min late and ground me over stuped ****. and that wouldnt bug me that much exept i have a twin brother who doest that same **** and they dont say a word when he does it. now my parents just took away my car for going clubing then instead of staying at the one girls house we stayed at my other friends house but they think i am not telling the truth. so they took it away for 3 months!!!! now its not like i was out drinking or somthing and i do chores and i go to school. but they tell me i should know better and that if i whent away to school they woulnt even car. and bc i am the girl they need to keep a closer eye on me. err its really starting to bug me and its what ever they say goes. sucking up doent work!!! help! i my car