Sabinacrn

I almost made a stupid nursing mistake and now I can't stop thinking and analyzing the situation. HELP please? I'm a first year nurse ( been a nurse for 10 months) and have started my new job one month ago. Today I made the dumbest mistake a nurse, or anyone could make. I drew up the wrong dose of insulin into a non-insulin syringe, (it was suppose to be given as IV PUSH). I drew up 0.4mL and ridiculously thought it was 4 units, when it is 40 units. I DID NOT GIVE IT. I asked another nurse to look at the insulin for four units and I asked in public, and she says "I DON'T SEE IT". The charge nurse and another nurse were right there, and she then told me that the dose I had was 40 units, not four! The three nurses around me just stared with their mouths open, probably wondering what the hell is wrong with me. I felt myself turn beat red in embarrassment I felt my ears were pounding. I did not give the medication, but the fact I made such a stupid mistake was ridiculous. She showed me the correct way to draw up insulin. I had given insulin before correctly many times. NOW i cannot relax. I've done well on the unit and worked hard, and now everyone knows what a crazy mistake I almost made. I'm new and I wanted to look competant, because I dont believe I am not. I just feel this moment definately left a mark, a humiliating one. I'm glad I had enough sense to ask another nurse for verification. I'm so paranoid right now, I feel like others will think I'm a terrible nurse or just stupid. Am i worrying too much? I have a habit of worrying what people think of me a lot, and I'm pretty sure they all think the worst right now. Any advice, from any nurse who's been in a situation similar is much appreciated?