Why are parents like this

Why do you think it's hard to move out dummy

Because if you don't get a job when you're 16, you don't have any money saved up to get yourself an apartment to move to when you 18.
Some don't get a job when they're 16 because of family circumstances, and others are just lazy.

No body said it was easy, do the work, your parents are. If you are not paying rent to your parents then they own the house it is theirs, not yours. If it is that important to you to live as you want you will find a way. Work two jobs, live in an apartment with friends/roommates to split the cost. It is what we had to do. I worked two jobs and had roommates so I could get out of my parents house. It is called sacrifice. As I said there is no such thing as free rent, in either manner the child will need to sacrifice. whether it is to obey the rules of their parent's house, or work more than they would like. It is possible, My three older children did it without my help. They are all living in different qualities of apartments depending on where they choose to divide their time between work and play.

tell that to someone in SF or NY.

Hm? Oh I think I phrased it wrong I mean those two are saying to just move out as though it isn't hard to find an affordable home

You do realize that first we have to find one that's affordable you can't just spontaneously move out

So go find one. Until then your parents are calling the shots.