The Core of Deja vu

Just the other day, I was thinking about my past and some of the things that I used to do compared to what I do now. There are so many changes, but it seems that most of the CORE parts of myself are still there.
I was thinking that maybe that is the same for all of us. We move through our lifetime picking up different things, learning and growing, but still, there always remains the CORE, the center of our being.
I remember hearing years ago that those first 5 years of our life are the most important. That, I believe, are the CORE years in our life that shape us and make us a start in who we are to become. This in a way sets the stage for the learning experiences and changes we learn and adapt to.
This thought got me thinking about how many of us have Deja vu and feel we have done things before and after leaving places. I have tried to understand this for years why we have those feelings and it got me thinking about that CORE set to our consciousness. That maybe we somehow predestine ourselves to the places and people we meet.
In terms of Deja vu, maybe we feel this when our lives hit the mark in which our consciousness is setting and this is the moment when we know we are in the right place at the right time. When our being lines up just perfectly with the universe.
It seems that when I feel Deja vu, I feel like something is right somehow, I feel like this is something that I should be doing even if it also feels like something I have done before. I feel that there are many moments in our lives that move us forward, but only a few that put us in perfect harmony with the universe. Maybe this only gives the thought that we have done it before and not a real experience that we feel.

I do believe this might require a little more thinking, but that is what I have come up with so far...Diana