I started uni in September 2015 and over the summer I was terrified about everything including fresher's week, the socialising, the course, living with strangers and just general surviving. I came from a rural village having had no real friends or social life for years, so the thought of moving into the city and doing all this crazy stuff was overwhelming. If its the socialising you're worried about, remember that you don't have to make friends in fresher's week. If you don't click with your flatmates it doesn't matter. I only had 2 flatmates and one has moved out so there's just the 2 of us. We have always just kept ourselves to ourselves since the start. There will be more opportunities to make friends such as on your course and societies, which is how I got to know people. I don't feel as if I've made any strong bonds with anyone yet, but I've met some nice people in the society I've joined, and some good course friends who I could potentially share a house with next year.
If I can survive university, then you can too!