I'm in a situation like yours, I mean some days are really boring / isolating and I think why am I here? - I could be doing this at home and mixing with more familiar people!
But I've discussed it with a few of my flatmates and we all feel the same really, we have put it down to the hall being crap - no sense of community and everyone keeps themselves to themselves really.
Things haven't been helped by the fact that 2/5 of my flatmates now work nights together and the other one spends a good deal of time with her bf in her room, and the other flatmate isn't really that social yet - and the other guy just finds the place too dull / boring so always pops off to his mates accommodation block... yesterday I joked with one of them saying how quiet it was when this is meant to be party central - but maybe I just had the wrong idea about uni life...
but anyway it's not all bad, I do mix with people from my course and do my best to socialise round my flatmates but I guess it's ok for me as I already knew someone who went to this uni (a second year, so just hang round with him and his mates).
But back to you, things just don't happen overnight and uni is hard work, you just got to make a really effort with everyone and throw yourself out there. Remember it's still fairly early too, so not everyone will have adjusted yet.
You're not alone....