How can I become a doctor?

Whats it like being a doctor? I want to be one when I grow up, I'm a junior right now and am taking anatomy next yr. I heard it is best in college If you major in Biology or some sort of science because it will help you in med school. But I also heard that you dont have to major in a science...you just have to take the premed courses and it would be ok. I don't want to major in a science tho. I like psychology but I don't want to be a psychiatrist! I want to be a pediatric oncologist or neonatologist... :) I love kids! It makes me sad when I see little kids injured/sick and I would like to help them get better.