Embrace the fact that significant learning is often, or even usually, somewhat difficult. You will experience setbacks. These are signs of effort, not of failure. Effortful learning changes your brain, making new connection, building mental models, increasing your capacity. The implication of this is powerful: your intellectual abilities lie to a large degree within your own control. Knowing that this is so makes the difficulties worth tackling.
Peter C. Brown and Henry L. Roediger III, Make It Stick: The Science of Successful Learning