I want to be a kid again, and it's not fair?

Yes, being older you have more freedom and money which are big pluses, but if I could change a few things about my childhood I didn't like and do it again... I am the same age as one of my teachers was when he said "Don't be in a rush to grow up. Being an adult sucks."
It makes me sad. :( As a kid you are just supposed to play and learn... things are so much simpler.
I want to be a kid again, and it's not fair?
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