To be fair, in my mind this is the one most common trait I find in successful entrepreneurs and leaders. I've seen leaders who I didn't think were particularly bright, or extroverted, or empathic, but man, did they not get stressed out by obstacles that came in their way. They either sidestepped them or overcame them, but they did not dwell on them and let those obstacles lead to self doubt.
This is one reason why I think sociopaths are over-represented in leadership positions. They are not burdened by a conscience that can lead to self doubt in times of stress. Of course, it's possible to have this "does not get discouraged by big obstacles" attitude and not be a sociopath, but it is certainly an area where sociopaths have a natural advantage.