Can I still be a doctor and not do extra curricular activities in high school? ?

I'm in the 8th grade and when I'm out of college I want to go to medical school and become a emergency room doctor. Right now I have mostly A's and I plan to work myself harder in high school. I'm taking not honors classes except honors latin because I don't want to have all that pressure my first year of high school but definitely in 10th grade I'll take honor classes. I've had bad social anxiety from as young as I remember and its most likely that I'm depressed. I don't want to join any clubs or sports because it's hard enough dealing with others in school and I'd hate doing it after school. Can I still be successful without activities?