Okay, you are a grad, so you passed! Hold your head up! As for the assertiveness, practice on a trusted friend to help you role-play being more assertive and self-assured. It will come with practice and time.
Where do you want to work, acute, LTC, rehab, clinic, dialysis? Apply everywhere and offer to shadow an RN. Get plenty of rest and eat regularly, do something you enjoy once in a while. It is amazing how many ppl in the health care profession don't get enuff rest and eat properly (she says while guzzling a Dr Pepper and eating chocolate
Let us know how you do!