I felt exactly the same at uni. After fresher’s week I isolated myself from my flatmates because I didn't want them to discover I was stutterer which made me absolutely miserable seeing them go outside and have lots of fun while I was lying on my bed depressed as fuck. What changed is when I contacted my uni’s counselling services and had speech therapy and even though I never became close to my flatmates I made friends with people in the block and other accommodations so things do improve!!