The Artist’s Self-Doubt

I write all these poems and draw my cartoons
And sometimes compose a few musical tunes.
It strikes me that while my creation is fun,
I’m a jack of all trades and a master of none.
Who else do I know who tries so many arts?
Could this be a sign I’ve been lacking in smarts?
Is specialization the way I should go?
I’m asking in earnest; I really don’t know.