Well, if you're talking with them and others show up, try to be friendly with the others too. Make sure you acknowledge them, saying "hi, how are you" etc., and perhaps starting a conversation with one of THEM. You might ask them what class they just came from or are going to, or their name, etc. You might ask them what dorm they live in.
Just try to loosen up. It sounds like you're a ball of nerves, and as stiff as a board. Try to relax -- yes, I know it's easier said than done, but just try. And keep trying. If you don't look like you're going to jump out of your skin, they might think you're more approachable.
And try not to worry -- keep a smile on your face.

That's what is attractive. They don't want to see a frown. I know you're scared & anxious. but try to keep smiling. This is all scary -- I understand, I really do cause I'm alot like you. But just keep trying and pretty soon it will be natural. It won't be a chore. God bless and keep us posted will you? I'd love to know how things go. Take care. Hugs, Lee