Should I change my major to biology?

Hi my name is Tiffany and I'm eighteen :) I'm enrolled at a community college and my major is business administration. The work is not challenging at all and I find it uninteresting. My pion is really with medicine. I want to become a psychiatrist. I know it takes strength, commitment, and above all brains which I have already. However, there may be financial issues because I'm very poor. I also worry because I'm a woman and want to have kids.