Countless students have said that they are interested in the field of medicine because they want to help people. If this is why you are going into medicine, be sure that your application contains evidence that you have helped people. Being a physician means that you will be dedicating your life to serving others. You need to be sure you want this.
One way to convey your commitment to service work is by volunteering and trying to make a difference in your community. Volunteer for Hospice, become a literacy volunteer or a Big Brother or Big Sister. Get out there, get involved, and make a difference.