Oh yes. This is so true. I had something close to a mental breakdown when I got to law school and I wasn't right off the bat automatically good at it without trying. Suddenly, School was Hard. So I freaked out, thought I was worthless for about a week because suddenly I couldn't even do the one thing I was always good at (namely, School), and contemplated dropping out and just becoming some sort of low-level civil servant secretary because bawwww clearly I wasn't Smart anymore. In the end, I sucked it up and learned how to actually work to be good at School, and I think I learned Valuable Lessons. *cue after school special music*

On the other hand, I've always wanted to write a novel, and even have had the idea for one, several detailed characters, and a skeleton plot outline, for years. But I haven't got the guts to even try to write it, because writing fiction well takes a long time and I'm SURE no one would like it and it would be Hard. THIS IS SAD.