I am not really sure when My first memory is, however I do have a few memories from Montessori or pre-montessori (I'm not sure what it was) and I can't think of anything from earlier than that. I don't know what age either, probably around age 4. So, a few snapshot memories I have are:
Crying the first day because I the school lunch had green beans that I really didn't want to eat; I'm pretty sure I was confused and stuff too, I tended to bottle things up. So, I cried the teacher helped me out somehow, I don't really remember the details of the even so much as things like the tin foil, the beans, the way my face scrunched up when I cried.
Being held in from recess because I couldn't write my letters and numbers fast enough. I think they might have been 6s or 9s... I was a little slow.
We weren't allowed to have candy at school, but some m&ms came with my lunchable. The assistant teacher told me to save them till after school but I really wanted to eat them so I stealthily ate them during nap time when the lights were out. I must have left one of two on my blanket because the teacher lady found them and yelled at me. I was sleeping over at a friends house that night too.
There are a few others.
I think I remember times when I got in trouble and/or traumatized by some event. Those memories stuck with me for a while and none of them are really associated with good time. though they are funny when I look back.
Although I am certainly not the same personality now, I can very much empathize with my former self and remember both how I felt and what was going through my head. I remember the reasons why I did things and the emotions: stuff like guilt, anger, loneness/being lost. I'm not really sure, I was like 4.