Do you agree or disagree?

I am 12 years old and my parents are very over-protective. Well at least I think so. I have a cell phone and have an orange belt in Tae Kwon Do. We live in the suburbs. So this weekend was like a very small type carnival type thing. I was gonna go with seven of my friends (5 girls and 2 boys) and no adult supervision. But of course my parents said no. Next weekend is another carnival type thing and I can't convince my parents into letting me go without adults. THIS MAKES ME SOOO ANGRY!! Everyone else is allowed! Except me!! Any advice? Do you agree with me or them? How can I persuade them?