Becoming a medical doctor is extremely difficult, I too am a sophmore student, and like you, struggle with English. For now, I must say that it is better to focus
on the present and aim at getting excellent grades.. Medical school comes after University, which in turn, comes after secondary education. Now, I am assuming
you are 15, and with that said Medical school is way down the road. I myself try not to think of the qualms of getting into med school, and do my very best in the present.
That is the advice I give to you.
P.S. Nearly all state medical schools are good, they only accept 300 or so applicants of the 3000 that apply. That is a 10% acceptance rate...
Hell, here are the statistics regarding marks at UBC medical school ( the school I want to get admission in.. hopefully).
http://mdprogram.med.ubc.ca/files/2012/12/Interim-Statistics-2012-13-MED-2017.pdf