I pitched with a chip on my shoulder and it actually worked out good for me.

A chip on his shoulder

I really had a chip on my shoulder, ... and it still comes out every now and then.

He came in with a chip on his shoulder. He's got something to prove. They did a good job picking him. They stole one. He's got borderline cockiness, but he's got enough humbleness where you don't think he's arrogant.

I have a huge chip on my shoulder.

I don't know if you can call it a chip on my shoulder or a monkey on my back, but I shed it today.