Question

What would be an opposing/counter-argument of how it's hard being an adult?

Answer 1

You could say 3 things:

one
Its a wonderful experience rasing a child
EX: sharing laughs and memories together

two
Being independent feels great. Being free to do watever you please.
EX: Driving to the places you want to go. Wearing what you want to wear.

three
Building your life the way you want it to be and being your own person.