Am I living with maniacs?

I'm 15 and I'm old enough to know what's wrong and right. I don't go out with friends so that makes me unpopular in school. But even though I never go out, never wear innaproppriate clothing and never swear my parents always swear at me. I've even timed them. They call me something every 5 mins. And my sister makes it worse. Whenever I blank her (cos she's swearing at me) she starts smacking herself and rip out her hair. Just now I just woke up so I went to watch TV, my mom started screaming names like, you ************, daughter of a *****, prostitute just because I was watching TV. Then she said how I never listen to her but I do! If she tells me to go pray, I will straight away and just cos I told her I will in five minutes she started saying those things. My dad even pointed a knife at me before cos my sis made up some lies and he believed her. I thought he was my best friend! But no I was wrong, if they want what's best for me, why can't tey just let me live my life? Oh I wish I was anyone but me. Noyone likes me! I mean whenever I talk, they say Im answering back and they start ripping their hair out! Is it me? Or is there something wrong with them? What should I do? Please help! And no rude answers k? Thank you!