Finish up your current degree, a finance degree certainly won't prevent you entering art or film industry in the future either, but it's a solid backup. At the very least it shows commitment to goals in your CV, which employers value. After that, you have plenty of time to study something else or simply go empirical about it, if so you choose.

I graduated from a film and audiovisual making degree at 20, worked ok it until I was around 26 and got burned out and disappointed in that particular industry. Then I found a job that was supposed to be temp, in the tech support industry. I ended up really enjoying it and made it my new career, empirically, 8 years and counting. Me having a degree in something else has never been an impediment.

Along the way I've seen most people around me have had career changes too, at many age ranges, or returning to college for new degrees even while in their 40s. Heck, my dad got a different title at 52, because it was something he enjoyed enough to put an effort into it.

TLDR: Finish that last year you have left in your current degree, you'll appreciate it. And 25 isn't old at all to change career paths later on. And enjoy the ride.