I appreciate everything you have to say, Mya, but I have to disagree on one point. When I have viewed medicine as just my "job", I felt very bitter at how it was separating me from my family. When I have been able to view it as my "calling," it is easier to do my best and stay focused on my work and not just the money.
Of course, it's not my most important calling, like my kids. It's just a different facet of my life.
"med student" you said

"I just know that residency is hard and if I am struggling now with lack of motivation now, how will I make it then?"

The best part of medical training is that every year you get closer to your goal. When you are in residency, you'll be actually doing (much of the time) what your life will be. Sitting in Biochem and pathology lectures may not be very close to your life if you end up in... certain fields. If you don't get thrilled by surgery, don't worry, you won't have to do it as a pediatrician, or vice-versa. Just because school doesn't thrill you, doesn't mean medicine won't have some joys in it.