Yes, I agree with you.
Student or Learner
For example, the song "Don't you worry child", does it mean "You don't (need to) worry, child" or is it just a question?
I ask this because in the after "Don't you worry child" the songs continues with "see heaven's got a plan for you", so i think if it's just a normal question it wouldn't make sense, because "heaven's got a plan for you, so you don't need to worry, child" would make more sense to me.
It's not a question. It's a command, an imperative.