Difficult

I was thinking about something that is hard or difficult. For example I was over hearing a professor speak with a student. I didn't hear what was being said. But the professor had a posture of sureness and confidence. I was remembering times when I was being taught. The teacher was encouraging me towards one particular thing. I had the perspective that "this is so hard." It seems that it wasn't nessasarily hard because it was more advanced or more complicated. But it seemed hard because it was far from me. Maybe what is easy to me is very hard to another, because what I find natural is very far from that person.