Because I have. I'm well aware that I'll always have room to grow (I've pushed against a lot of my edges, and found that they "give"). Maybe, from the quote you gave above alone, that would mean that I've self-actualised: I recognise my full potential (specifically, I recognise that it is unattainable by nature of potentiality!) and keep pushing anyway.

Going beyond that, I certainly tick all of Maslow's criteria. But I don't think they are sufficient to fulfil his definition (and I don't think that his examples - Maslow listed many historical people who he believed to have self-actualised - help the matter either).

Perhaps it is language that failed him, and he lacked the tools to describe the self-actualising state. I'm a big fan of the actualising tendency described by Carl Rogers (who was doubtless informed by Maslow, over the years in which he wrote): the idea that an emotionally healthy and functioning human will, given sufficient nourishment, tend towards their own betterment: the goal that might be called "actualisation". But it's not my opinion that anybody ever reaches it.

To me, the quest of actualisation is like trying to walk to the horizon: no matter how close you get, it'll always be as far away as you can see... and I suspect that a characteristic of emotionally healthy people is to understand and accept that, and keep on walking anyway.

And I wouldn't call that state "self-actualisation".