[unimpressive]

http://en.wikipedia.org/wiki/Imposter_syndrome

Pressure to succeed in ones youth is ubiquitous in certain industries.

I think this song about the music industry pretty much sums it up: http://www.youtube.com/watch?v=ca9GJ6mMxLw

[opminion]

Another possibility is http://en.wiktionary.org/wiki/false_modesty