I decided to correct your writing using notepad, so it was impossible to use some of the aids here to indicate what I changed. The more detailed the writing, the harder it is to correct. Changes are not always simple and can be made in different ways. That being said, "Eccolo"

Hi! This is my first time here, and I'd like to tell something about my strange life and my strange job.
I've already been a student. When I was 13, here in Italy, I decided to study "developmental science". You can ask me, "What is that?", and I can tell you that it has been the worst decision in my life. I studied to became a teacher but here, in this country, it is not so simple. I had to continue to study at the university and then, take a masters program. Trying to enter a program,well, that is like trying to touch the moon. At the time of this wonderful decision, I had not yet discovered my passion for numbers and for economics.
And so, after my certificate, I decided to work for some time in a school, not as a teacher, but simply as a babysitter ( for an after-school program for children that couldn't go home because their parents were still at work). I've discovered that it isn't my real role in the world.
This experience has made me see my future more clearly. I decided to improve myself with further studies and I took a course that has really changed my life. It was an economics course, related to banking. Again you can say, "What?"! First a teacher and now, a banker? A broker? Yes, a broker. I love everything related to it: I love numbers, I love statistics and all the graphs that help me try to anticipate the market.
For now, I'm still a baby sitter. I do this job solely because I need money to pay for the university (to pay for schooling) and, for this reason, I feel so much motivation to continue, to do always my best with every day, every exam and every situation that I find difficult.