Hello and welcome,
I am so sorry you had a depressing time with your nurse. It really is not your fault you have diabetes. Anyone can get diabetes, fat or thin.
I am a little confused because it says under your avatar you have gestational diabetes, yet your name is Richard? If that is just an error you can change it in your settings. I assume you have type 2?
Have you been given any medication? It would be helpful to know this, and also what your HbA1c was on diagnosis.