It will honestly get better. I graduated this year and I'm seriously missing it, they will become the best years of your life, so please give it a chance.
I felt exactly the same way 3 years ago, I cried every day as I hated my housemates as we had nothing in common. I even considered dropping out. Looking back it would have been the biggest mistake ever.
Even though you might feel like they have already made friends, you can never make enough friends in uni. Try and talk to them in the communal area you have, sugest going to the pub for a drink, or go for a night out as then you will have plenty to laugh and talk about the next day.
Have you had your freshers fayre yet if not try signing up to some clubs and societies, as that is a great way to make friends and you will all have something in common then.
Trust me you will make friends on your course too as these are the ones that you will have to see in lectures everyday.
Hope things get better for you, I know what your all going through