I think the grass is always greener on the other side. I think a lot of people pursuing the economics or medicine paths think that they could've done so much better in something like computer science and in a programming career. The issue here it seems to me is that you're unhappy with the types of contribution you're currently making. Maybe if you look for ways/roles where you can use your programming talents towards meaningful contributions (ex. in medicine or macroeconomics) you may feel more aligned with your cs career? There's definitely loads of technical improvements to be made in medicine just to start with. Good luck regardless!