Trying23

So, I have been a nurse in the same facility since June of '09....so I've been a nurse for a little over a year. I'm still a newbie. I think I'm pretty good at what I do. I get along with all of my coworkers and have never had a patient complain about me. I'm always on time, and I'm always willing to help others. My problem is medication error. Since I've started I've made six....today being my sixth one. None of them caused any harm to the patient. Today's error: Dilauded order was changed to 0.5mg q3 hours from 1mg q3 hrs. Well, it wasn't changed in our medication giving machine. The machine told me the order was for 1mg and that I would need to waste 1mg. So that means I would have to draw up 0.5ml....I saw the 0.5 on the MAR and saw that I had 0.5 and gave it....two times before I caught my mistake. Another nurse was complaining that she had made her first mistake in the the three years that she has been working....I feel so incompetant. How can I have already made six, and she's only made one. I know a lot of people don't admit their mistakes, but I have...and I don't know what to do. I've slowed down. I triple check myself. I don't know what else to do.