I'd been struggling with the same from high school all the way up until recently. I'm about to graduate with one art degree and am headed back to my old university to complete my original art degree (kind of long story, but it works out), and always had a "knack" for art. My family always pushed me to get into it throughout high school, saying that I should do something I love, but I just didn't want to do something I loved and come to hate it because it becomes a job. That really made me dread doing art in school.
But fortunately for me, I found a career in the field of art that I'm actually super excited about starting a career in, and fortunately for me, would bring new projects periodically, so I would always have something new to look forward to and to challenge myself with.
I guess finding the kind of art you'd want to make a profession out of is the best way to do it, instead of just looking at it like it's all just "art".