Am I in the Right Path?

I have an interest in Biomedical Engineering. I am in my last year of high school. I always had a passion for math and science, but growing up I always wanted to be a doctor. I was planning on becoming a Pediatric Radiologist after my undergrad in BME. I sometimes doubt my path and sometimes I don't know if it is the right path to go down. I feel like once I start school I won't do so well as far as understanding everything and making good grades. I need a little insight.
posted by Ah'chontay, South Carolina on June 3, 2014