Aaahhhh, fooey on mean people... We all start somewhere. First off, you need to be confident. ACT confident, even when you're not. That will come with time.
You are NEVER going to make everyone happy or like you, for reasons that may or may not be valid.
Once you start to believe that your not-so-kind co-workers are just that, "co-workers" things will probably lighten up a little bit. Plus, it seems like the OR has a pretty high turnover rate & people that are experienced probably are just getting frustrated with training, training, training, to have people leave.
One little hint that I have found to be the most beneficial when dealing with "attitudes".... be HONEST if you don't understand something. Pretending to get it when you don't can potentially negate any positive progress you have made in someone's eyes. They will wonder if you can ever be trusted. Plus, not being honest when you don't understand can be detrimental to the safety & well-being of your priority in the room... THE PATIENT.
When you hear gossip, keep your mouth shut...no need to repeat it. If someone is ******** about something/someone to you, there is no need to talk about it.
You say you got yelled at for being in the way.... When you are with a new person or in a new procedure... be honest, say you're not familiar with the procedure, prep, or whatever & ask your preceptor for the day "what can I do to help" & then do it. So much of OR work is based on getting the patient in & out, sometimes it's hard to take the few extra seconds to explain in detail what's happening when the surgeon is screaming at you.... Make a list of questions you have throughout the day & GET THEM ANSWERED. Each day is a learning experience & you are never going to please everyone everyday. You'll drive yourself crazy trying to do that.
Do you have a clinical educator that can work with you? Take advantage of that. Ask to go in a lighter case, or a somewhat slower room where the circulator will have time during the case to answer your questions.
I have learned from experience, that setting a goal for the day, telling the person you are working with your goal for the day, you will have a better chance of achieving that goal & start becoming more confident in yourself.
The person you talk about in your OP was probably just as stressed.... could have been the day's cases, the surgeon, a bad night sleep. People are going to be crabby somedays....brush it off. I'd just about bet my right arm that it wasn't meant to be directed AT you & more directed at her frustration of trying to get the case going.
Hope this helps a bit...