A great pile of utter rubbish is talked about 'Freshers' - and usually by people who aren't at University yet.
If you listen to all the silly stories, you'd think it was a week long festival of alcohol and general debauchery that would put Ibiza to shame. Yes, of course there will be the immature who discover beer and sex in the same week and think they invented both, but 99% of all students don't actually behave like that.
Freshers is about introducing you to Uni and breaking the ice before formal teaching starts the following week - a few nights out together are part of that, but that doesn't have to include clubbing, or even alcohol, if that isn't your thing. Lots of people will hang around halls, or do quick visits to pubs and bars. Lots of people. So don't get worried about this aspect of Freshers - just do what you enjoy, and don't feel pressured.