The Kimya Dawson song “The Competition” is a great anthem for this.

I just wanted to prove wrong the voices in my head… the ones that told me that I would never win
When I delivered newspapers they said I was to slow
When I was a barista they said I made lousy foam
When I worked in retail they said I was a slob
Much too dumb for school and much too lazy for a job
So I rode my bike like lightning
I made cappuccinos that would make the angels sing
Took two showers a day and I dressed up like a princess
Shook my fist in my own face and said “I’ll show you who’s the best!”