credulity
n[U]
too great a readiness to believe things 轻信
a statement which stretches/strains one's credulity to the limit, ie is almost impossible to believe 简直难以置信的陈述.
I am sorry that you have a disagreement with your father. Personally, I think it is important to follow your interests and your abilities, and it sounds as though you have plenty of both of these already.