Ah, I wish I could help you, but I am in the same situation! It's like I have made friends, but they all seem to just hang out with their own flatmates or their own friends. I feel like I can talk to people on my course, but struggle to find people I can actually spend time with during the day and night outside of uni. My flatmates are nice, but they are in their second year so they have already established their own friendship groups. I am sure if we keep at it, things will work out eventually.