Hey man, been through it, for like 13 years and it never felt like the last one, i would go to my teacher before class began to let her know that i have a stutter and when the students introduced themselves, my teacher would skip me by saying ‘Oh i know you’. Trust me doing this is better than skipping the first day (Yeah i did skip school the days we had introductions or presentations) and yeah it does happen to the best of us. More power to you for managing that phase.