Feeling a little down about a job interview

Feeling a little down about a job interview Today I had a job interview with the USPS to work as a mail carrier. I feel I didn't get recommended because I seemed a little anxious. That's because of my slight stutter, I think I was smooth for most of the interview but maybe some parts, not so much. I wonder if she thought I was nervous? I feel like I should've in the beginning so I can feel more relaxed. What do you guys think? I emailed the lady who set up the interview about it, but it's probably too late.