how can i further avoid people in my house

what have you tried so far?

I just try to make sure I have something to eat an drink in my room, something that will be ok if it sits there for a little while without going bad, so I'll have no reason to leave my room and let people know that I'm awake. A banana can be eaten quietly but it wont last more than a few days.
I sometimes bring in a packet of chips or something, although in the UK I think you call them crisps. But anyway, they can stay there for months! I also spend most of my time awake at night. Although I'd do that anyway since I love night time. And I always make sure to go to the toilet before anyone else will be up.
But I need a new chair, it's too noisy, especially for this house. Maybe I should get a bean bag!

@Redstar: all of that is literally things i used to do lol sleep in the day eat quietly bring food in and never leave lol but then they just knock and all my efforts are over
you should def get a bean bag for quietness and cause they are awesome

Just don't answer when they knock, that usually works for me. Unless they've heard that I'm awake or something.