Honestly, given how close to the beginning of the year it is, I imagine that most of the plans which people make now for next year won't actually become a reality, particularly if you've all just started uni without knowing many people. You'll likely all have different friendship groups by the end of the year, and there's no telling what fallings out or other issues might occur between people who are currently planning to live together next year.
That being said, you do have to live with these people for the rest of this year, so it's not going to be a great experience for you if you're worried that they don't like you. I would talk calmly to the person in the group you get on best with, and ask them whether there was a particular reason why you were the one who was taken off the list. Make sure you speak to them face to face, because people are a lot less likely to become confrontational in person, and there's much less chance that they'll misinterpret what you're saying as being angry or aggressive (since you can't tell someone's tone over text).