Are you male or female (the name implies female)?
Mostly the girls (OK women...but in dance classes it's usually guys and gals, or boys and girls, regardless of age) before class can start talking about their children and husbands, rebuilding the house, etc. No one is comfortable with strangers, but when the girls get together there are so many things to start talking about. You can ask someone about the type of slippers they're wearing, or the tights or skirt...ask them where they bought so and so...etc.
If you're a guy in a class of mostly or only women, listen to what they're talking about before class. If they're talking about really feminine things...it's more difficult. But if they're talking about their children, you can ask about the kids...what ages, etc. If they're talking about the conrracter and remodelling the house, push in with male-like advice about how difficult it is to match different types of wood or paint colors.
LISTEN. Then you can put yourself in the discussion.
As far as who to stand next to at the barre...look for the classmates who have had some experience with dance...it helps if you need to follow someone. Look for someone who has expereince....and can remember the combinations the teacher gives.
I've had many years of dance, but have had some neurological problems. So I often take beginner classes to help me regain my center and focus on the basics. I can remember the combinations (I've usually done them a thousand times before), so many classmates try to stand next to me. That naturally leads to discussions. If I miss a class, I'm chastized the next week for not showing up.
A class brings its own intimacy between classmates. You just have to want to be a part of it, and go for it. Don't stand back, but feel free to contribute. Ask the teacher questions if you don't understand...because many of your other classmates probably have the same questions.
Most of all....enjoy your self. Life is short, stand back and you'll miss most of it.
balletboy[/i]