Because honestly different people have different levels of maturity. The average 13 year old is probably not as mature as you are, and they really just want freedom. I'm only 17, and I know that it's true, and I know I was exactly like it.
I was stubborn and I wanted my parents to let me do what I wanted, I thought I know everything. But pretty well, I was an average teenager who thought I knew best for me when I didn't. I'm not saying that's the case with you, I don't feel like any teenager, no matter what age, should be treated like a kid.
But it's an unfair world, and chances are it will unfortunately always be like that. :(.
Its not that you aren't getting any answers to your question; you're just not getting the answers you want. There is no answer to this, there's only opinions. The way your question is worded only proves the point that 13 year olds are still very immature.
At your age, you are not considered an adult and still a kid is because you still lack the life experience and emotional maturity to conduct yourself as an adult would. Your choices and decisions are still made based on selfish reasons, which is a common trait of the adolescent brain. There is no hurry to grow up anyway.
Forget about the labels that people give you and remember that there is plenty of time to be an adult later on. Enjoy this time instead of complaining about it.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.