I sort of have this situation at uni, i have friends on my course but they never go out with me or meetup outside of lectures except for work because they all have their own friends. I have two friends who i met through a society and we play sport together, but i never go out with them either. I barely ever go out, i only went out about 3 times the whole of term two. But luckily for me, i enjoy my own company and i can spend hours in my room quite happily, the truth is that i don't really enjoy going out and getting lashed, I just like a quiet drink with friends but no one seems to do that at uni. Anyway, I don't really think there is a miracle cure for finding a good group of friends except for being friendly to people, try not to be shy and gradually work on aquaintances until they become friends. Keep going to the socials and eventually you will become more friendly with people. Go the the badminton sessions and maybe try and get a regular partner etc. Also, try to make friends in lessons, i find they are the easiest place to do it as you regularly see the same people.