Have you considered doing both? It wouldn’t be easy and may take 5+ years, but you could pursue a dual major/dual degree path if you are really passionate about them and pick the right school.
My son attends the University of Rochester and is pursuing a BS in Evolutionary Biology and a BA in Political Science, since those are his two greatest passions. Thanks to UR’s open curriculum (with minimal required gened courses), he will graduate in 4 years with both degrees.
I just checked UR’s website and it looks like a BS in Biochem requires 23 courses and a BS in CS would be another 17 courses, give or take. Plus, there’s a requirement for clusters in humanities and social sciences (because Bio and CS are both natural science subjects), so another 6 courses. All of that would probably take at least 5 years, although you could do a BA in CS instead of BS which would reduce that major’s course requirement to 12. It may be possible to do all of that in 4 years with careful planning and some AP credits.
Something to think about.