What is the theme to the poem Welcome to Society by Erin Hanson

Welcome to Society
We hope you enjoy your stay
And please feel free to be yourself
As long as it's in the right way
Make sure you love your body
Not too much or we'll tear you down
We'll bully you for smiling
And then wonder why you frown
We'll tell that you're worthless
That you shouldn't make a sound
And then cry with all the others
as you're buried in the ground
You can fall in love with anyone
as long as it's who we choose
and we'll let you give your opinions
But please shape them to our views
Welcome to society
we promise that we wont deceive
and one more rule now that you're here
theres no way you can leave.