I would think your mentor would be ok if maybe only one or two roommates had a sit down to start. Ask your roommates who they are close to. Than maybe have the close roommates sit down together with you there. If everyone is in agreement you should be able to meet with them. I have learned over time that my parts want to know they are being heard. Even my angry parts want to be acknowledged as being heard. Also ask if there is any part that wants to help with the meeting. Most time there is someone who would like things to settle down so everyone has less stress.