Family Crisis? Is this fair? What Should I do?

URGGHHH, I feel like living with my friends family - which we are planning to do. Me and my friends family. Everything i told them about my family about being grounded for nothing and being screamed at when it aint even my fault and my sister getting treated like shes a princess and me like S*hit, yeah i think u get where im coming from :D. I get grounded for nothing and i retaliate when i get told off because i wanna show my mum and dad what they are doing to me which i aint done. I get blamed for mostly everything. I get grounded for the most stupidest things like inviting a friend round after school with out telling my mum, i mean like at school i invite them round straight after school. Even if it is homework to do. I get screamed at when i say like why are you screaming at me when i aint even done anything. My mum also has to be right. She always has to scream at least one person. My sister gets treated like an adult and gets quite a lot of things.............even though shes 16. Im 14 and my birthday is in 49 days and i am going to look for some stuff i really want now and i bet you they will say no you cant have it or no you dont need that or why do you want that or no you dont want that, when i really do. My sister would look for things and would literally beg my mum and dad to get it........and she dont get told off but if i did that i would. What should i do.