It would also seem to me that they are treating you like a child because you are acting like one.
You seem to think you are so hard done by!
I managed to combine A Levels, 2 part time jobs, a lot of voluntary work, being an RAF cadet, running the college climbing club and a lot more stuff.
I think if you are anticipating that your degree is going to only be a little easier than your A levels (especially if you want to get a decent grade), I think you might be in for a bit of a shock. Degree level study requires a lot of self discipline and time management and sound decision making (preferably without having to come onto a website to ask all the time).
I know people who have combined study with working full time, sometimes with evening or weekend jobs as well and raising a family.
My house isn't always pristine but then I work hard for a living, I work an average of 11-12 hours a day and am often in at the weekends and even when on holiday, I pay my rent, bills, buy all my own things, do all my own housework, make my own meals etc... If I am short on money as it's needed for important things I make sacrifices, if work needs my full attention it gets it, if I need an early night to be fresh to get in early I don't go out and party.
I earnt having my own space and being able to do my own thing and I'm definitely not moaning. You live in your parents' house off their money so I'd say it's pretty fair that their rules go.
You sound far from illtreated and when you can earn and support yourself you can live in your space by your rules.
You think life isn't fair now, wait until you get into the real world.