Put your big man pants on and do your best - LOL. Trust me no one will laugh, in fact you might get help and tips from other lifters. Powerlifting is great that way.
I was having sumo trouble at one of my earlier meets. I was approached in the warm up room by Steve Scialpi who worked my deadlift form and fixed my sumo on the spot. Some time later I trained at his gym for a year and he put 60lbs on my sumo. Powerlifting is full of people like him. Just go to the meet and lift what you can, it will be obvious that you're a beginner and you will find nothing but support.