"When faced with obstacles, setbacks, and failures, those who doubt their capabilities slacken their efforts, give up, or settle for mediocre solutions. Those who have a strong belief in their capabilities redouble their effort to master the challenges. (Bandura, 2000, p. 120)."
Have you ever heard anyone say, "cut 'em some slack" or "give 'em a break" and thought that person was just being nice? Turns out they were doubting someone's capabilities - essentially saying, "I don't believe you can do it." Wow. Not very nice.
I don't feel sorry for you - I believe you can do it. If you don't believe you can do it - I wonder what or who shook your confidence to believe?
"...Ordinary social realities are strewn with difficulties. They are full of impediments, failures, adversities, setbacks, frustrations, and inequities. People must have a robust sense of personal efficacy to sustain the perseverant effort needed to succeed. Self-doubts can set in quickly after some failures or reverses. The important matter is not that difficulties arouse self-doubt, which is a natural immediate reaction, but the speed of recovery of perceived self-efficacy from difficulties.. . . Because the acquisition of knowledge and competencies usually requires sustained effort in the face of difficulties and setbacks, it is resiliency of self-belief that counts. (Bandura, 1989, p. 1176)."
Gu, Q. & Day, C. (2007). Teachers resilience: A necessary condition for effectiveness. Teaching and Teacher Education 23, 1302–1316.