According to novelist Maria Semple, when her first novel, This One is Mine, came out, the notices were good but the sales were not. So she retreated into herself, stopped writing, and blamed everything and everybody but herself.
Then one day, a friend told her something:
Maria, you’re a writer. Writers must write. If you don’t write, you’ll be a menace to society.
That line later showed up in her novel, Where’d You Go, Bernadette?
It’s good advice. In fact, one could use the reverse of it as something of a test. If you don’t write for an extended period of time, and feel just fine about that, then maybe writing is just something you do, and not a vocation.
Not to mention a generally healthier way to live.