Parents wont let me [19] leave earlier than uni start date

Sorry my phrasing and writing isn't great, always hated it.

Basically I hate living at home with my parents and brothers. Don't get me wrong i love them to bits but Its just a pain in the ass to be sharing a room with 2 others people in a little room with 3 computers in it (30 degrees+ on a cold night if we're all on it). Another problem is that they both constantly argue and drives me crazy when i have work at 6:30am 4 days a week. The job transfer to uni would start on the 11th September and i start uni on the 19th September.

I told my parents that I would move in on the 24th august so I could sort the house out with (bills, internet etc) and get all my memberships sorted. They said to go down sort it out then come back but i've told them they're all being done over the 2 weeks (dates were set when we got moving in date) but still expect me to come back every time (2hour drive each way).

What the fuck do I say to them because everyday becomes worse as I feel like i'm trying to hate them more for treating me like a kid who has no say. I've already tried saying that I need to be my own person and live independently but they're saying its disrespectful to not listen to them and do what they say.