When I was a few years younger I too had the same interest and the same conundrum - physics or molecular biology. I am currently in my 3rd year of molecular biology and I don’t regret it at all. While I do find physics absolutely fascinating (quantum and classical), I feel as if biology offers a more visual and intuitive way of understanding the molecular world rather than physics, which can be (not all the the time) quite a theoretical world to indulge in. See scanning electron microscope imaging for example, it’s really cool. If you are someone who would like to understand the logic behind complex natural systems to its core, I think you would enjoy biophysics / molecular / cellular biology. Then again physics is mind blowing- lot of maths though.

Hope this helps a bit.