Switch to Medicine or Push Through?

I'm currently a freshman at a difficult 5-year math & CS program in some European country. For the past two months I've been contemplating switching to medicine/medical school but have a very hard time coming to a decision. I applied to this math & CS-program due to my interest in research in computational neuroscience/machine learning. Unfortunately, the workload has been very high (60h/week inc. lectures) and I feel that I'm at the brink of a burnout. Simply put, grading here is quite non-lenient and I've lost most of my interest in pure mathematics. Having said this, things will probably become significantly easier and more interesting during the final 2 years of the program as I can specialize in CS/machine learning. Finally, while the program is very selective, it’s quite obscure internationally. Combine this with the non-lenient grading and I think I’d be at a major disadvantage applying to US PhD-programs. Basically, I don’t know if this path is realistic for me anymore. On the other hand, my interest in medicine and neuroscience are significantly higher than pure math, but a little less than machine learning. I’m therefore considering switching to medicine as the workload is significantly lower (40h/week inc. lectures) and international reputation being much better (top 10 worldwide). In fact, the medical school is very well known in academic circles, and I could definitely do a PhD in neuroscience here as research is very good. If everything fails, I can still work as a physician which is something I’m interested in too. I do however feel like I’d be wasting my “talents” by going into medical research instead of machine learning. To conclude, would I be making a good or bad decision by switching to medicine? Although both neuroscience and machine learning are very interesting, I think I prefer the latter and see more potential in it. Having said this, my probability of success by aiming for the former is way higher.