Adulthood grants you freedom and autonomy over your life. Childhood is highly variable and you often have very little control.
I went to a decent public school in the US, a lot of the teachers I had were dumb if not cruel. It was like spending a lot of time doing busy work in a prison run by the least successful adults of the previous generation.
Great teachers made a difference and were outliers, but were rare. I’ll take being an adult and having control over my life a thousand times over being a child that has to wait until they can be free.