Why this career?

When I was coursing last year of school, I didn't know what I wanted to study but I just had the idea that I wanted to study something in which I could bring help to the people. 
When I took PSU I still didn't knowing what I wanted to study so I expected get the score for to discard options.
When I receive my scores, I couldn't eliminated any option because I got a great score, so I talked to my parents for what to do and they told me to choose a career that I tought it could be fine for me and I put on the system for first option "sociology in Universidad de Chile".
Four hours before the postulation's system closed, I changed my first option for Public Management. It was an impulsive act but it was the best decision of my life. Why I changed my postulation? Because I was boring, reading posts in Facebook and I saw a publication that said "What do you want to study and where?" and there were a lot of comments that said "Public Management in Universidad de Chile" and it was like "what the hell is that?", I searched in Internet the career, I read the description and I fell in love so I changed my priority of postulation and I didn't even look in other Universities because what Universidad de Chile described was exactly what I was looking for.
I choose this career because I think that one person can change the life of a lot of people. When I arrived here I realized that wouldn't be so easy, but here I am with my objetives clear and I would try to change step by step until I could be able to design and implement public polities.
Now, I still loving the career and I think that my favourite subject until now has been "Evolucion y complejidades de la Administración Pública", that's because in that subject was the first in which we realized what we would be doing when we finished the career.
The most significant think that I have learned is that not all the people has good intentions, the fight for the power is heavy and not always the best person wins, a lot of people would like to destroy you but also, there are a lot of people that wants to change that and I'll keep going because I know what I want to do, and I keep dreaming that bad things can change