The most important thing to communicate with roommates is sincerity. You should live in the same room. In life, you should take special care of each other. If others need help, help them as much as you can. Be sure to take part in any group activities in the dormitory, otherwise others will misunderstand that you are unsociable. Speak modestly and slowly, so that you can make yourself comfortable.
When we first entered college, we used to pretend to be B for each other. Within a month, we all showed our true colors. We often go to play together, eat together, help each other when we are in trouble, and have a good relationship. Therefore, it is good to treat others sincerely, and it would be better if you could take the initiative.