i mean... i don"t agree

I would hardly say being under 18 gives an individual a significantly less ability to exercise ones freedom of speech by the law. Freedom of speech under your parents and schools policies is because you are a minor still. I would say your frustration derives more from not being a legal adult and not being able to make personal decisions without the consent of a guardian. Also minors are often just flat out stupid, disrespectful, and uneducated about what they have to say, thats why individuals get in trouble. The lack of not being an adult might put limitations on freedom of speech, but not much. A 16 year old could go out onto the street and blabber his head off about politics, write a self published newspaper about how much he hates the government, or petition against something; a 40 year old man could do the same things.