When you start learning Spanish, few things are as intimidating as speaking in front of bilingual Spanish speakers.
Oh, the horror of these two-language speaking monsters. They hear all your errors, roll Spanish words right off their wicked tongues, and secretly laugh at your thick accent. Such evil!
Hang on. You know you have to have a sense of humor about the learning process. And you know that you will make mistakes. No big deal. You can shake laugh at yourself along with native Spanish speakers.
But nothing is worse than going through all that language craziness in front of bilingual Spanish speakers.