My understanding is that F&G are culturally different from N&A, but I think you're probably being a little too hard on yourself. The company probably spent a lot to recruit you, they have some interest in helping you succeed and I don't think they'd hide performance problems from you.

You probably shouldn't be idling though. If you can't think of any ways to be more productive, you should ask your manager and your colleagues for their ideas about what problems exist and what needs to be done. HTH.