3 years ago, I was also in the same boat with you. the best thing I can advise is to just relax and try to be yourself, not paying attention to your stuttering. I'm sure there will be understanding people in your study group. it may be difficult at first, but I assure you, time will fly by quickly and you will already feel that you have adapted to these people and your new stage of life. honestly, I couldn't sleep for the first six months due to worries regarding new people and studies and living in a dorm, but after a while you will get used to it. Just try your best and keep in mind that everything will be fine in the end