My Path into Physics (at MIT)

I did the Graduate Record Examination (GRE) subject physics in order to apply for a Phd in Physics this April but I had a score which means that only the 5% of the applicants (of the exam) have lower score than mine. So the 95% of applicants have better score than mine. It was very disappointing and just quit to try to enter to Calgary University. Now I'm not sure if I am good enough to try to apply to another Canadian universities. I'm from Mexico.

Do you have any suggestions which can help me in this situation? 
Or any advice to encourage me to try again?

Nice videos, all students of physics have many things in common. =)