Introvert nervous about making friends at exeter uni? Watch
What are you nervous about exactly? The fact you are "expected" to go out every night? Honestly I don't think you will annoy anyone by not doing so. I was in the same boat (introverted), but when I got there I realised a LOT of people felt the same. Having a shared interest breaks the ice for sure.
Try not to worry so much-more than likely, you will be fine. Hope you both have a great time!