A small group of people together in a strange place tends to bring everyone into the feeling of “us”. You get to spend long periods of time with others in a fun setting, and being surrounded by strangers means the “what will others think” social pressure goes away.
But that does not mean that people change. If you can’t stand your classmates now, you will be miserable with them in Italy. But if there are people that you thought you might like to know better, this is a great chance.