I was in your shoes 20 years ago. Already had my interview setup for MIT and I was concerned about the same thing. I let this fear stop me and it was my biggest regret in college. DON’T LET THE FEAR CONTROL YOU. I ended up going to a state school for engineering, which was still a top 10 program. Very active in student programs and clubs, and stuttering was rarely an issue academically or even socially. I had a ton of friends, and internships, and mostly happy with my career. I hope this motivates you to reach for your potential and not let these insecurities hold you back.