So if a person trys to be Narcissistic is that the same as growing up a "healthy Narcissist"?
Probably NOT. Not totally sure what you mean here, but if we swap in "self-interest" for "Narcissist"... it makes a little more sense to me.
I think the term you're looking for is "healthy Narcissism"... not "narcissist". "Healthy Narcissism" is just one trait or personality characteristic of a self (and I didn't get this until I changed the word to "self-interest"). Not sure there are any healthy Narcissists. Technically speaking, if one qualifies for the PD label, one is by default, not healthy. Other people might have a different definition. That's OK by me... this works for me, right now... and there might very well be something better out there.
Narcissism is somthing that *we*/ or one is not aware of though right?
If you mean, about ourselves - that might be one way to tell someone with healthyN apart from the malevolent kind; N's - in my experience - have almost NO self-awareness in the area of how they impact others - and you point it out to them, at your own risk. Coming out of my self-fog, I discovered I was overly-obsessively- concerned with how I impacted others... and I didn't accept the premise that it was OK for me to look out for myself, nurture myself, take care of myself, have a self-interest to protect. Once I did, like a teenager in a growth spurt, I was kind awkward and gawky - LOL! Flailed around a lot and went too far to the other extreme for my own comfort a couple of times, requiring apologies... and lord knows I bemoaned the difficulty of finding my "comfort zone", here, a lot! That wasn't real dignified in someone who was about 50, but it was important for me to figure it out. It DOES settle down to what's normal for yourself... and because "normal" is a range and not a specific mark on a target... it also varies from day to day, life stage to life stage. I suppose one might consider that the "normal" learning process - trial & error - of developing healthy N... and it doesn't really matter what age one learns this, tho' it's like learning a language - probably much easier at younger age.
What does a Narcissist brain look like? What are Narcissists doing to other's brains?
HMMM. I don't think anyone's studied this exact set of questions. As to the latter question (again, my thoughts are) that growing up w/N in a parent - while the brain is developing, influences certain kinds of brain-neurotransmitter connections... what we usually call mental/emotional "habits" - those habitual thoughts that generate the same old feelings... and even affect one's behavior. It is possible to change those habits - it's a lotta work. That's one reason I decided to celebrate even the micro-successes I could think up... it was the only way to keep myself going up the change-curve and not give up in exhaustion & frustration, until I could see myself at a plateau of change. That plateau was built of things of like: not smoking each & every time hubs did (pavlovian chameleon type things)... brushing my teeth twice a day until it felt weird to NOT brush before going to bed... to shake up and re-create my self-care and self-soothing strategies... and to loosen the "set in stone" nature of those brain connections that a person can't directly "edit" or repair or "put right".
How is Narcissism any different than plain old dominance and competition?
See the self-awareness observation, in the second question. Also, I think normal folks have some limits and boundaries regarding dominance and competition. Taking turns, not "needing" to dominate all the time... not needing to always "win" in order to have fun, feel good about oneself, etc. Letting other make "the rules" and switching roles constructively... all of which recognizes that "other people" are equally significant and real human beings - not simply objects to prop up an Nself. A non-N's self-respect and self-care and emotional state doesn't completely depend on the approval, respect and adulation of other people. The non-N isn't completely self-sufficient, either - they still have needs for emotional and social interaction with other people. But how the non-N thinks/sees/feels about him or herself doesn't hinge completely on their "outer" image - how others see/feel/thinks about him or her. (THAT was circular... there has to be an easier way to say that.)
Of course - these are just my thoughts & observations & experiences and not a definitive, expert opinion. Sometimes, the expert opinions don't give enough credit to people's actual experiences, but then actual experiences are one-off, subjective anecdotes and aren't one size fits all. Both are important in their own way. The next person along, can expand on my ideas, I'm sure. In the meantime, I hope this helps.