OP, hang in there! Undergrad is a major adjustment. I think almost every pre-med has experienced stress at some point in their college tenure and has also, at times, questioned their interest in science and medicine. I personally do not feel that a C- in a 3 credit first year pre-med course should be enough to turn you off of a lifelong career in medicine.
I always thought of the premedical prerequisites up to and including much of the MCAT as more of a right of passage than as courses/knowledge that I had to LOVE in order to confirm my goal of becoming a physician. I think that upper level courses like physiology, biochemistry, etc. may be where you fully realize your intest in medicine (For me, these classes were incredibly challenging but also a pleasure to take, and I think that says something). That said, for most people wishing to enter medicine, a deep interest in the intricacies of the human body and how things work at their deepest levels should be a common denominator--not in all cases, but in the majority. After all, in practice, doctors are much more than technicians, and delivering patient care requires a commitment to scientific knowledge. What it doesn't require however, in a retained knowledge of organic chemical reactions, photosynthesis, and fungal anatomy, which is why you should not become too jaded by the premedical curriculum.
The following I cannot stress enough: While I am sure your parents have your best interest at heart, and I know how rewarding it is to make my own parents proud, a career in medicine needs to be about you and your ambitions. At the end of the day, it will be you putting in 5-7+ hrs a day of MCAT studying, weekends in anatomy lab, and night call on clinical rotations. The other jobs you mentioned are great and will also bring you satisfaction. If you end up as a doctor, that is great! If not, also great--there are plenty other jobs where you can provide for your family, help others, and feel good about yourself. For now, I would say hang in there, don't rule anything out, follow new interests, figure out what YOU want.
