Show your parents you're actually trying to go out and get money and etc, I bet you then they'll be more lenient on how long you stay. Luckily my parents would never kick me out either, and my step brother is still here and hes like 20 now!
Just think of all the old fat guys that live in their mother's basement, do you really want to be like that? And dont think that's not what would happen to you, because it will, you'll keep saying oh I'll move out tomorrow, do it later, etc, and then the next thing you know it, you're a 50 year old man with cheese puff stains on his keyboard and mouse living in his mom's basement. THIS IS NOT THE LIFE YOU WANT.