Getting into medical school?

I'm a college freshman, majoring in Chemistry. My grade point average is a 3.46, I volunteer at hospice, have a great premed advisor, have mentors who are both doctors, and work full-time. Yet, I am still really nervous that I am not doing enough to get myself accepted into medical school when the time comes. Does anyone have any suggestions on what else I should pick up, or any other career options I may be able to follow with a bachelor's in Chemistry, in case I don't get into Medical School?