As an amateur or hobbyists musician (aka the seriously enthusiastic), there can be a number of things that stand between you and your practice. If these are your internal dialog, we have some gentle reminders to rethink your love-hate relationship with your practice.
1. Not enough time
Finding time to practice is hard. How about just a few minutes a day? Consistency matters more than duration.
2. Not enough energy
Practice doesn't always have to be super hard work. Sometimes you just play.
3. Never good enough
We're taking a wild guess here about Yo-Yo Ma, but it's probably not too far away from the truth. Don't be too hard on yourself - and that's for you too, Yo-Yo Ma.
4. Too much work
The amount of work needed to get better is daunting. There are always more scale, more techniques, more etudes, and more repertoires. You will get there - one step at a time.
5. Not enough progress
Progress is not always a straight line. Sometimes stepping away from something is as important as sticking with it.