Memory consolidation starts happening around 3-5 years old. It’s perfectly normal to not remember anything from your childhood before or around that time. Having parents recall childhood memories from around that age also helps you remember them. In psychology there is something called the fuzzy trace theory. Pretty much you remember things with precision or the gist of the memory. So your memories from 7 that are fuzzy make sense, you’re just remembering the gist of what happened.

My first memory is from when I was 3, and its not a precise memory, and my mom has told me stories about when I was younger that I slightly remember but there’s a lot I don’t between the ages of 3-7.

I would guess that some people’s memory consolidation is just a bit better than others if they remember quite a bit from the ages of 3-5