How i lost my passion for Medical Assistant but gained a new one

Back in 2011 I decided to sign up for Medical Assistant class. In the beginning I was nervous because I had no idea what I was doing. The only thing I knew how to do was the blood pressure thing. It was already week 6 and I did not know how to do an intramuscular injection or a subcutaneous injection heck I did not even know how to draw blood. But with help from classmates I learned the injections, the weight and how to do an EKG. Already 10 weeks in the class and my passion for medical assisting started to grow. More than anything I wanted to help people. Even though I wasn't doing so good on the tests I still dedicated myself to the career of wanting to help people it was a high passion. Every time that a new student would walk in, I would take the pleasure of helping the new students and teaching them the ropes and some of the students they would look scared and I would be thinking "hey I went through the same thing". But for some reason it was also hard to be in the class you know I mean I had this defensive attitude, one day the teacher literally yelled at me and I went to the restroom and started crying, I realized that what he said was true. I don't really know why I am the way that I am, maybe its because I've never felt accepted, anyway the class was soon coming to an end and I knew that after that would come the externship where I would have to apply all the skills that I learned in class and put them into practice at the clinic. 3 weeks after the class was over I found an externship site. But me arriving at the clinic was not a good experience. The doctor would snap her fingers at me rather than call my name, the boss would treat me like crap and to top it off the one who hires told me that they don't hire externs at their clinic, this is where I started to feel the pressure. When I got there I did now know how to do the blood pressure I would get it wrong and I did not know anything about the weight scale, but during the 2nd week I learned the ropes. When the lady told me that they did not hire externs I literally felt like crying, sometimes in the clinic I would feel the impatience of the patients and they would come back and forth asking when I would see them. It was really stressful and then the nurses in the labs would tell me "hey you should be a registered nurse". Once I finished my externship, my next step was to go to medical terminology class and typing class. But as I started going to medical terminology I realized that my passion for medical assisting was beginning to fade away. I don't know if it was the experience that I lived in the clinic while I was doing the externship or simply I lost the interest in this. But the question is: how is it that I lost my passion for medical assistant but gained a new one in the process" In the summer of 2012 I started spending time with my camera and the year passed and as 2012 and 2013 passed I realized that my true and highest passion in life was photography. It was staring at the me in the face all the while and I did not realize it. Now this year I will sign up and get my bachelor's degree in photography. The advice that I can give to people is to follow your dreams and don't let people tell you what you need to be. To this day it still bugs me that people tell me "u should be a nurse" sometimes I feel like shutting them up. Follow your passion in life and live your dreams with intensity and make them a reality!