I know exactly how you feel. But that’s not exactly “about you” Try to watch someone else stuttering online. You're going to feel bad also. I felt the same way before. Don’t be hard on yourself. We are who we are. If you got that internship, it means they really don’t care about your stuttering (and that’s the truth - you got the internship!). The reality is: no one cares about our stutter as much as we do. Wishing you the best!