Deeninteen

Hey everyone, i am a new grad that is 1 month off of orientation. Unfortunately I made a major med error today and I was hoping to seek some advice. In short, I didn't administer my patient's AM insulin by accident and I found out that her blood sugars spiked to the 20s by lunch. The patient was asymptomatic and I notified charge and the MD. She was reordered insulin and her blood sugars were still elevated as I left the unit. I filed an incident report and am now wondering if nursing is for me. After thinking about what happened, I can clearly identify that it was incompetence on my end and not an insulin pen fault. I'm not sure what I was thinking but I didn't administer the insulin when I injected the patient. I'm absolutely embarrassed and more so angry and beating myself up that my stupid mistake caused harm to a patient. My question now is: should I call my manager to disclose the error? Should I find a way to speak with the family to disclose the error? And finally, what are the chances that I will be fired? Running this through my head, I feel that this is a mistake that should never and has never happened in regards to the new insulin pens. It's made me really question if I am safe and if I should continue with nursing.