I agree with a lot of the others here; the way your acting is, to be fair, a bit irresponsible.
I'm back from my first year at university too at the moment, but whilst I've had the freedom to do what I want at uni, I respect that my family have let me come back and stay with them for a month here, and that, as such, I've got to abide by their rules. I would never think to spend all of my time sleeping in their house, never helping out, and lazing around in my pyjamas. I get up at a reasonable time here, get dressed, and help out if they ask me to, because in return I'm getting a place to stay for a month.
Just because your lifestyle has changed in the past year, that doesn't mean that theirs has, and while you're under their roof you should learn to adapt back to their ways, it's not a case of being treated like a child, it's a case of being adult enough to understand that you can't always live 'your way' and have to consider other people.