My very first day of school was pretty low-key, which in hindsight I really appreciated because I was beyond nervous. I remember my mum helping me find my classes on the map and being early for all of them! Seeing other kids rush in five minutes late to each class made me feel a lot better about being so anxious about being on time - though I think that's a lesson every new student has to learn for themselves at some point.
I do have an embarrassing story from later on in primary school though. My year 5 teacher had this habit of asking random students to deliver messages to other teachers because she was too pregnant to walk around the school herself. She'd send anyone but never checked if they knew where they were going - which was problematic because the school was massive. She asked me once and, unfortunately, chose that day to send me on an errand to a teacher in another wing of the building. I had no sense of direction even then so I just picked a direction and started walking, hoping I'd somehow find the classroom. Ten minutes later I still hadn't found it and the other kids were beginning to file out for lunch so I just went home - figuring she'd sent me on a wild goose chase by mistake! I got in so much trouble when she realised what had happened; apparently, I walked right past the classroom three times!