You're going to make mistakes, we all do. As long as you're learning from them and not letting them get you down. Coworkers will always gossip and talk behind your back, sadly. And that's ANYWHERE that you go and one thing that I've noticed is it's really bad in the healthcare field. My advice to you would be to not let it get to you and make you dislike coming to work. Keep your head up and continue being the great nurse that you are!