Once I'm on the air, it's like a receiver getting overloaded and I kind of stop copying. It's emberrassing. I bet others have been asking themselves "what's wrong with me". too.
There's a "beginner's nervousness" that will go away. I encourage you to spend a lot of time listening... jump in when you get a chance.
When you hear a beginner struggling and screwing up even his own call, why not help him along?
There are Old Farts who have been doing this for most of a century, have a vibroplex, and can't even send there own call.
I will be far more likely to help a beginner than the OF's who can't send their own call. If the beginner is trying to send faster than he can reliably... I'm less likely to step up and help.