What are my standards of writing that make me a writer?
There's a certain quality of writing that, I believe, is necessary before someone can fully be satisfied by calling him or herself a writer. At the same time, only you can tell yourself when you're proud of the writing you're producing. When starting out, set yourself a goal to read your own work and evaluate it critically. When you're satisfied that you're really writing at the level of work you yourself would want to read, then you can be confident that you're a writer.
After the jump: what about being paid, and is the writing or the salary more important?