Third Musing: What Makes a Personality

(random daily update: I couldn't write yesterday because of a very bad stomachache :P I must say, though, that I should call these ramblings instead of musings. Thank you for putting up with me.
~listening to Yamagami no Mori he from Hotarubi <3)

So I can safely assure that many of my friends would expect this post by now. I guess I'm what one would call a psychology junkie? MBTI, enneagram, Global 5, astrology, quizilla character personality tests, you name it. Some I like more than others (that would be 1, 2, and 4 on that small list) and I use them to obsessively type my friends, characters I like, celebrities, or just people I'm interested in, in general.
As for me, I'm an ENTP, 4w3, and Pisces (Aquarius moon), which happens to be extremely contradictory. (4 symbolizes individualism and loner tendencies while 3 needs success and depends on admiration from others). Pisces is emotional, Aquarius is rational and so forth, but enough about me. I was just pondering that which contributes to one's personality. Personally, I was never much for the theory stating the brain is your being. Despite the opinions of what I like to call narrow-minded scientist types, I believe in a soul and that the heart, not the brain, rules emotion.
I also never understood the people who claimed that children are just a product (or sum?) of their parents. Yes, I've definitely taken mannerisms and ways of interacting with people based on what I grew up with, but I have my own unique personality that's been with me since I was born as does everyone. I like to claim some individuality.
Another thing that annoys me is that my English teacher (though she's actually my favorite English teacher ever and she is amazing, I promise) one year always had us focusing on our identity and while she told us to look deep within ourselves (and present our findings to the whole class twice a semester), we also had to focus on "external identity" such as race, religion, neighborhood, etc.). I can honestly say that I don't care about any of those and they do not contribute to my inner self whatsoever and reading those articles saying that we are also a product (sum?) of these things was equally irritating. Let's go down the list then:
Race: coming in contact with racism can certainly make one's life harder, sure. What else?
Neighborhood: good or bad can determine your life, not your inner core
Religion: can corrupt or improve a person--nothing to do with personality or who someone truly is.

...So that's my $0.02.