You Heard Me Correctly, Mr Parker

Peter wished he could say he managed things differently, and not like the under-age, naive kid everyone treated him like. The Avengers and co. wouldn't treat him like a child if they actually knew him.
Long story short, he snapped.
6 months later and Peter hasn't spoken to Tony Stark or any of the Avengers since. And he wasn't planning to ever again, until Mr Harrington's announcement. But that wasn't the worst of it.
"I'm sorry, what? I think I misheard you, Mr Harrington."
"You heard me correctly, Mr Parker," said Mr Harrington, gravely, "You've been banned from Avengers Tower."

OR

Peter struggles with anxiety unknown to Tony and he gets himself banned from the Tower.
A fic with a sprinkle of a field trip trope and a dash of harley/peter at the end (not developed)
Anxiety is the mature theme as there are swearing and panic/anxiety attacks which may trigger some readers.
Also posted on ao3