Replying to NSers going through premed/med school.

I'm currently a sophomore recreation/tourism major and business minor at CSU and I'm rethinking my career choice. I'm strongly considering changing my major to biology and going through CSU's premed program. I have always been able to picture myself as a doctor but going through premed and all ready being 2 years behind is incredibly intimidating. Has anyone gone through pre med that can offer some advice? I'm really struggling with this decision right now.