leah, you are starting the wrong kind of post
you keep asking again and again: why are not the adults treating me with the respect due to my age?
what you should be asking is: how can I prove to the adults around me that I am mature enough to be treated as one of them?
and perhaps also: what do I stand to lose by insisting on being treated like an adult?
the truth is that when they see you as a child, people protect you, they cut you some slack, they make allowances
as an adult, they interfere less but they expect more
if you want to have that, you have to show that you can deliver more: more hard work (this being what adults do), more mature behaviour, more responsibility taken for your own situation, less blaming of others
there are many teens who are much happier being treated as adults and who do actually manage to achieve that
they are the ones who don't blame others when things go wrong, who seek solutions to their own problems, who have a plan for what they want out of life