How do i fix things with my parents?

Im 15 and I hate my home life, i have an older sister who has recently come home from UNI and she just winds me up and then i get over controll and sware and cause problems to my parents but how do i get them to understand that i try to behave but my sister is just sooooo unbelievably selfish and greedy! I hate my life but i don't have enough indapendance to be emancipated or have a job or anything! Some one please help! :'(