Am I doing something wrong?
Yes, “If you're not enjoying what you are doing, then you are quite likely doing something wrong”. For the act of doing alone —the joy of creativity— should be reward enough. In the pursuit of external rewards —whatever they might be— we push ourselves into all manner of doing somethings. This will likely end in dissatisfaction. As without joy, there is little possibility of achieving your best, most creative and satisfying work (self).
He who binds to himself a joy
Doth the winged life destroy;
But he who kisses the joy as it flies
Lives in eternity's sunrise.
– William Blake
Now, I’m not saying that joyful work should perpetually be without strain or discomfort, for there will always be times of both. Yet, within the underlying purpose for the effort is where meaningful enjoyment resides.
Before you volunteer or sell your time to do or make something, sit & breathe and contemplate the true reasons behind your desire & eagerness to do so.