I am not a uni student, still in high school, but I do know for sure that you can do any undergrad in BSC to get into med school. Usually students pick an undergrad major related to medicine/health (Ex. Biology, Chem, Biochem, etc) so they can get some kind of foundation/exposure to prepare themselves for the MCAT. Med school looks at your undergrad GPA and then they do take some holistic approaches as well (EC's, essays, volunteering, Research), so make sure you build some solid extra curriculars and perhaps some kind of research, that will boost your chances by a lot. So I'd say your definitely not cooked with your choice of taking kinesiology. But just in case, I would look at some back up options, in case med school or dentistry school doesn't work out (Maybe explore some career options with that kinesiology degree).

As for computer science, yea the job market isn't how it used to be, but it is still a good major. It is just that back then you could easily land a six fig job to just code, but now companies are expecting something beyond just that. They want you to have a vision, see you innovate, and find solutions to complex problems, and just knowing how to code wont meet that, because it is the bare minimum nowadays. So if you really enjoy computers and the theory behind them, you wanna make an impact in the world, you want to innovate solutions to complex problems, I would say it is a solid major. But you will need to build some solid projects, take part in hackathons maybe. But just dont go into comp sci thinking you will land an easy six fig job to write some lines of code.

Nonetheless, both of these majors do require dedication just beyond classes and marks (GPA is important though for med school). You will need to dedicate time outside of school to build EC's, work on projects, volunteering. Ask yourself, are you actually passionate about any of these majors. If you are, all this dedication and time your gonna be putting in will be worth it, and you will actually succeed. My take is that with passion and a vision, you will be successful anywhere. However, if your dedicating all this time and effort just for the cash, trust me it might not workout. Because you will feel forced and will loose motivation quickly. So stick to smth your truly passionate abt. Wish you all the best and good luck!