How else will I know if I’m on the right track?

Work doesn't feel like work.

Now, you might still worry about how you'll make a living and whether pursuing your passion is really going to work but if you find that you lose track of time when you're doing the work, it's a good sign.

Chuck Jones, the animator for Wile E. Coyote, says it well:

“You have to love the smallest part of what you do or you’ll never be any good at anything. If you don’t love it, you’re in the wrong field. A real musician loves every dotted eighth note and I love every animation frame.”