A couple of years back when I started at College, although I'd gone to one a load of my mates had applied to, I had a meeting with no-one else I knew. Back then I was shy as anything, and didn't have a lot of confidence, so I was bricking it a little.
But I told myself, say hi to people and be open, and I'd made three good friends by the end of the day, one girl who was even trying not to let me go home!
My advice: don't worry! If you do, try and hide it, as it does show and that's not what you want. Be yourself, be smiley and approachable, and look interested in other conversations!