How do i get independence from my family?

I'm a 20 year old student who still lives at home, I know it's very stupid and immature for me to ask this question now... I'm still in education but I want to move out. I don't have a job but I don't want to sponge off the government (hence why I stay at home) and I don't want to move out without money, that just makes no sense... anyway, I'm on a look out for a job. When at home I'm not the stereotypical "lazy" student making a mess, I help out. I wash up the dishes, I do the ironing and do rations, so if there is anything they want, I get. Basically anything they want me to do I do. I save up my money to help pay for both me and my mum's joint car insurance. I don't mind staying at home until I get a job and studies (besides my family don't want me to leave), the thing that annoys me is they treat me like a kid. I'm not allowed to go out without their permission, I'm not allowed to stay out later than 10pm, there are certain clothes I can't wear simply because they don't like it. They even talk to me as if I'm 2, yes they baby talk me, they baby talk a 20 year old. I appreciate all of their help and raising me, but it's gone beyond a joke now. Basically what I'm asking is how do I make my over-protective family stop treating me like I'm 2 and realise I'm an adult? I have my own views and I can take care of myself but they don't want to see it.