Go to Fresher's Fair and look at what societies are on offer - many of them will offer taster sessions in the first few weeks of uni which are almost always free and if you don't like it, there's no obligation to go back. I was a committee member for two years for my society and our taster sessions were FREE, we provided sticks if you needed one (hockey), and we all went to the SU after for a catch up with returning team mates and get to know new people. Probably half of the people who came and tried out didn't come back, which was a bit disappointing but if they didn't like it, we weren't offended. Joining a society is the best, best way to make friends who share mutual interests. Your student's union website should have information on them and many will have their own instagram pages.
If you've missed freshers week, you can still have a look at what societies are on offer - we invited people to come down and watch/try for 4 weeks rather than 1, so if you couldn't make the first session you could still come and try for free. It may depend on your SU but it's worth checking if you missed taster sessions but want to try. Your SU will also have information about who the club president/vice president is if you need to contact them directly.
Go to your course induction as well and yes it's nerve wracking but see if anyone wants to go to the SU or a local bar/pub as a course/class.
I also found signing up for the student rep programme on my degree was good because people came and spoke to me about things in the department and it led to friendships with people in my department.