When things are tough, here's a fun question you can ask yourself.
What's cool about this?
What's cool about this thing that I'm doing?
Learning a musical instrument has challenges. It's part of the gig. But, how cool is that you get to work those challenges and grow?
How cool is it that you are in a place where you can understand the challenges to begin with? To understand a language most will never know?
When you stop to appreciate what's cool about what you're doing, everything becomes more exciting.