I need a little advice!

Hi, My name is Bretney. I am a freshman in high school and also a straight "A" student. I have already decided that I want to be a pediatrician when I graduate. However, I am now thinking about taking it a step further and becoming a Neonatal Physician( which works with premature babies). I want to go to a really good school. My parents want me to go to Harvard medical, but i dont know if i can get in. I need some advice form anyone who has any idea what i should do to make myself stand out more compared to other people who are also trying to get in to that school. Also is there anyone who knows some other really could medical schools. Thanks so much!!!:-)