yes you'll be fine making friends! Some of my greatest friends i met by going up to people in lectures and asking to sit next to them, chatting to people out side lectures, and going to society events. Don't be afraid to put yourself out there because everyone is feeling the same. - Also don't worry if your flatmates aren't your cup of tea, from my experience your better friends are those you chose to hang out with (course friends etc) as its not such a forced relationship like with flatmates