A couple of thoughts from an old person:
first, doing a hobby or even passion for fun and doing it for a living can be quite different. Be sure you want to ride the horses others dont want to ride. Also be prepared to deal with clients in many, often uncomfortable ways. this is where the advice to be a working student can help.
Secondly, you are likely to work at your chosen profession for many hours and years! It took me a while to realize that it didnt have to “fulfill” me (this is where free time to pursue your passion comes in) but it took a few false starts to realize that I couldnt bear to do something I really disliked even if the pay was good. Life is just too short. So think about your other skills, talents and interests when thinking about other career options. I ended up teaching even though I took a pay cut to do it. I (mostly) enjoyed it and made enough to support myself and a horse and show locally. But I would have been miserable if I was only in it for the hours. YMMV