Am I Professional or Amateur?
Read whatever you like for 'writing'. I love this quote from Agatha Christie - and IMHO, it's as applicable to any 'hobby' or art you have a burning passion for:
"There was a moment when I changed from an amateur to a professional. I assumed the burden of a profession, which is to write even when you don’t want to, don’t much like what you’re writing, and aren’t writing particularly well." Agatha Christie