Don't Fear Mistakes
Sometimes we forget that, as human beings, we ALL make mistakes. We also think that making mistakes is terrible, awful, and will bring negative attention to us. This is simply not true. People are not judgmental of mistakes, since they make mistakes all the time, too. If you are alive and have a life, you're going to make mistakes. That's how life itself works.
Don't be ashamed or embarrassed by your mistakes. Be happy you took the step and made a mistake. It means you are being proactive, and doing your best to actually LIVE life. And voila! You LEARN something from each and every mistake you make, thus giving you the right answer and keeping you on track for overcoming social anxiety!
Mistakes are wonderful. You get a chance to change them, and the learning that occurs propels your life forward. There is NO rational reason to fear making mistakes.
You will be OK. You will survive. It is something you'll be able to laugh about in the future!