amateurs

Am I a Professional - How Do I Know?

That’s a valid question to ask I would say. How does a photographer/artist know when they have reached “professional” status? I am sure all of us have pondered this question at some point or another in our illustrious careers as artists, whether it was when we were first starting out or a few years into it.
What types of things determine whether an artist is an amateur or a professional? This is a battle I am struggling with, in my own head. I am not a full time photographer but does that mean I cannot be considered a professional because of my current situation? My “situation” being I work at a full time job at the moment and am continually honing my craft on the side. I do have a photography business which I am running in addition to my full time job as an audio visual technician.
I currently show my work in local art shows, I have a web site, I have had paying photography jobs not to mention sold quite a few of my photographs to people. Does selling your work make you a professional? I am often curious as to what, how or even who for that matter, dictates a photographer a pro or an amateur?
I am going to go out on a limb here and say that all of the aforementioned criteria are contributing factors as well as (and I think this is a big one) having a “professional” attitude and knowing how to deal with and handle your clients.
This is just my two cents on the topic. A topic I find a very interesting. I wanted to stir up a bit of conversation on the topic and I would love to hear from you on the matter. What do you think makes someone a professional? Care to give me your “two cents”?