Though we may experience joy and desire while entertaining the idea of learning new things, the experience of learning itself often imparts a contrasting experience filled with unpleasant feelings like frustration or agitation.
To experience these emotions are not a signal that you’re falling short in the learning process. Quite the opposite: they suggest that you are going through the necessary motions to acquire knowledge and develop new skills.
There’s no reason to treat the learning process any differently than a physical workout.
There is invariably some kind of pain experienced along the way, but with it comes adaptations and growth.