at 19..yes you should...at 18 you can vote and fight for your country.... but on the same note if you live in their house SOME parents like to use that against you....so if u dont like it & ready for the REAL world..move out. then u only answer to yourself.
I agree with the others, Their house, their rules. That being said, it depends on which decisions you are talking about. They cannot chose your friends, but they can decide who comes in their home. Some parents will only pay for college if you go to a certain college or take a certain major. That would be their choice to pay, and your choice to accept their terms. You could take what ever courses you want if you work and pay for them yourself. I could go on but I think you get my point.
It is called "The divine right of parents". You might not like it, but there is little you can do about it. Yeah, you COULD move out and hopefully, you will NOT need any of their support outside their home, but if you SHOULD...There is a good chance mom, dad, or both are going to put conditions on their next hand-out to you. How do I know this? Well I don't really, I'm just speculating, but I have observed this parental behavior first hand myself over the years and you do not want to know how old I am!!)
are you acting like an adult and making thoughtful and responsible choices? Are you doing your fair share around the house without being asked? Are you looking for work, and applying for colleges? All of these things contribute. Just because you're legally an adult doesn't mean you're mature enough to think and act like one. The way people treat you is in direct correlation to your behavior...just sayin'