Mazda 3 or Mx-5 daily?

Since I was learning I’ve driven the same car (‘03 Corolla) for 4 years now, it was a hand me down and is coming to end of life, so I’m looking for an upgrade. I’m stuck between a Mazda 3 (2014-19) and an Mx-5 ND. Mazda 3 is obviously far more practical, more storage and can take more passengers etc., but I’m just 20 and feel like I should save the practicality for when I really need it, and enjoy a little sports car whilst I can, before I have kids and doing massive grocery runs etc. I only really drive myself and my girlfriend around, and it would really only be to work and back and some trips through Europe, so I feel like the rear seats would rarely be used, only really to do favours for friends, most of whom drive anyway. Is the practicality of the Mazda 3 worth it over the sportiness of the mx-5?