Switching to exercise major instead of biology to be a physical therapist?

I am a atypical student as I dual-enrolled in high school and had 30 credits before graduating. I wasn't sure what I wanted to do. I went from a chem major to bio major and now am strongly considering DPT school. (technically I will be a senior by credits in the fall) I still have to finish organic chem prereqs and bio 3 then I will just have 29 upper level credits until I would graduate with a Biology degree. Currently my GPA is a 3.70.

I know I still have the hardest courses to go such as...

Switching to exercise major instead of biology to be a physical therapist?