I’m guessing this is ‘when you realised you were a human you’ (or appearing to be one at least). It’s not who you really are which is why you were here ‘being you’ before that, you just hadn’t labelled yourself and identified as separate from apparent others. So if I’ve got it right that this is the question you’re asking, I have no memory of it. It seems to happen for most people around 18 months to 2 years so often doesn’t find with a clear memory of it.