Hey there,
I also have controlling/over protective parents. The thing is, they sort of start to slack off after they have their last kid. I'm the oldest of four and its pretty tough for me sometimes. Wait no, all the time
I'm the one who is responsible for everything whether or not its my fault or not. I think to some degree, my parents would have a hard time living their life without me and I'm not saying they are mentally retarded, I'm just saying they depend too heavily on me and maybe you feel that way too. I know you're only 16, but hopefully soon they will see that they are being a little too hard on you. But being the oldest, in expected of a lot the most out of the four of us. So I know how that goes.
So, to sum up (since I blabbed a lot
) I would just try to communicate that you feel like they depend on you for a lot? Its pretty typical in most families and I can totally relate to what you are going through now.
If you need anything or want a friend to chat with, I'm always around.
Hang in there,
~A