I have already applied to schools for DPT after graduating in Music Theatre. I took a few of the pre-reqs in my free time at school, but, overall I had very few when I graduated. I was extremely unhappy as an actor, and after hearing my loved ones speak on how great physical therapy was for them, I looked into PT for myself, and loved medicine and the body in high school. So, I applied to work as a PT Aide in a local office, and started taking classes online. And, yes, they were online from community colleges. I couldn't afford to take them anywhere else, in fact I tried and broke my budget completely. The online option allowed for me to work full-time in the office to get hands-on experience.
What I found when applying was that most of the schools just wanted the classes to be accredited. Check with the community college on their website to see if they are accredited. It's pretty simple, or just give them a call and ask. They will be a member of some regional accreditation service, like Midwestern, etc...The schools will take them, and of course they may weigh them differently, and dock a few points for not getting the pre-reqs at a "competitive" school, but if the grades are good, you should be fine. Really. Just trust me on that. I've had a few nights where I thought I was wasting my time at a CC, but other PT students who I have talked to did the same thing I did.
As far as the degree goes, I can honestly say I found NOTHING on the application processes that even mentions favoring a major with science related study. Will that degree make your study in the DPT program easier? Of course! But, will it determine whether you get in? Not really. Have good grades, observe to see if you like the field (observe not just from the patient's point of view, but from the work side. You will definitely find out if it's as romantic as it seems from the patient's perspective. Hint: it's not very glamorous at all, in a good way though. I freaking love it), and be well-rounded and involved. Don't apologize for your background, just come to the field with energy, hunger, and good spirit. You can't change your past, and just say that your business background will come in handy if you want to open or operate your own clinic someday. Why not use your background to your advantage?
Good luck dude. Even though I haven't even started school, changing my career to the PT path was one of the best decisions I have ever made. You're still young, so be happy with your career path.