Im worried abut school?

well today i move d.t groups, most people have allaready moved but i was ill on that day so today is the day. Basicly i know what d.t group im in i asked before we moved, but, i don't know anyone else who is in my group. I think one of my friends are in it but i'm not really friends with her. What can i do? What if i go in there and i don't know everyone, im a shy persona and i like to be with my friends and friends only, theres no way i can move because im not with my friends! :{ What can i do, how can i make myself talk more to these people??