Honestly I don't think that this need be a bad thing, as long as relations are cordial.
What you're seeing at the moment (and I take it you're a fresher) is a kind of lifeboats circumstance with people clinging on to who they can get. It was never at all likely that the 5 best friendships you could forge at university would be with people assigned you by the accommodations computer and the fact that you're ready to say "they're not my thing" is perhaps evidence of a confidence in you.
It can get a bit much to be living with the people with whom you're to be doing all your socialising, and still moreso when these were not chosen. Strains show themselves when you're sharing a fridge and a bathroom or dependent on someone else's good graces for a decent sleep before a test.
This can be difficult to see in the first few weeks and at 18, yes. But when I did my MA, I was put into a shared flat with three others and thought "they're nice enough people but we're too different that we'll really be best buds", I recognised that as ideal.