Well, not exactly (More like an independent writer)

My mom told the piano salesman that I was a writer.

He looked at me and asked, “Who do you write for?”

“For myself.”

“Oh, so you’re a freelancer.” 
Well, not exactly. A freelancer works for different employers at different times, selling their services at a rate per time period or per project. I don’t write for anyone. I don’t sell my writing service. I just write what interests me for as long as it interests me, and then I write something else when something else interests me. 
But instead of explaining all that, I just said, “Yeah, sort of.”