LOL!
Its called anxiety, and alot of people get it when confonted with alot of people.
You are not alone! I get that way everytime I have to teach a new class of people that I dont know.
As for the farting part, I let it go silently and then blame it on someone else
Unless I am at home... then i proudly trumpet my hoop and watch me family run out of the room. Works great during NHL season!