Had this stutter at the worst possible moment…

Had this stutter at the worst possible moment… During the job interview, which consisted of three rounds—aptitude, Group Discussion/JAM, and HR interview— I successfully aced the challenging aptitude test during the first round of the job interview. However, during the second round, which involved Group Discussion/JAM, I struggled to come up with an opening line. The person conducting the session noticed my difficulty, offered me another chance, but unfortunately, I failed in front of the audience. Surprise surprise! I wasn't selected. The final round, which was technical, proved to be easy compared to my friends who had passed it. Mentally, this experience is affecting me significantly.