Feeling powerless

Hello I am feeling powerless about everything in this world and also standing up for myself to society and the government and tell them how I actually feel and also I want to have more of the power to tell people in what I feel unhappy with when I have been picked on and when I have been treated like a child. I really need to build more of my strength and power to stand up for myself to society and the government to tell them what needs to be improved in this world and for people in their early 20s to be treated as adults and be allowed to make their own decisions and be able to tell people to not tell me what to do and to treat me as an adult and respect the choices I make.