I’m really scared

I’m really scared I’m an 18 year old girl who’s had a stutter my entire life. It seems that my stutter has worsened within the past couple years and i’m not really sure why honestly. I’ve had a few jobs within the last 2 years and my stutter has sort of hindered my ability to do the job properly (because it involves talking to customers) and make friends in these jobs. In a couple weeks i’m due to move away from home for the first time and start a big girl job in a company but my stutter is making me very very scared of making friends and doing the job itself, i’m scared i just won’t have any friends because my stutter prevents me from talking to people unless they talk to me first :/ the first month or so of the job are these various icebreaker activities including a residential trip for a few days and the idea of doing it without anyone to talk to makes me feel sick. any advice??