At the first day, people in class were not friendly each other. As time goes two days, people became to be more friendly each other.
I had a lunch with three people. Having a meal with don' know person is not awkward anymore. I think I'm getting used to be more socialize.
Spending a time with don' know person is of-course awkward. So you don't need to too much worry i think. Definately the other person will be not much comfortable. So just keep trying to talk naturally.

