I like your work, it shows very serious promise. One thing you need to think about though is shop rate. That 17-20$ range you guys calculated? It's wrong. That's what your shop rate is, not your rate. I understand that you may have access to a free shop space right now, but that won't always be the case. You must begin to calculate the price of your work based on your time as well as shop rent, electricity, all shop supplies, new tool purchases, and a % for profit and growth. My shop rate is 100$ an hour, no exceptions. Someone working for me is 65$. A decent place for you to start is 45$/hr.
Now I'm not saying start charging that tomorrow, but you should start figuring it out. When I first started I was all over the place just like you are. Sell one of my own designs? Not for 18 months. So I understand where you are coming from, and you are on the right path. Just know that your name and reputation are forever, and this business is all about word of mouth. Once a client pays 500 for a couple of chairs how do you get them to pay 3000$ for a bookcase? It's a constant balancing act. I would encourage you to consider where you want your career to be in 15 years, now chart a path to that place. As a client I don't need to know that you haven't sold one of your pieces yet (You just sold those chairs so cherry popped anyway,) I just need to know that you can do the job well. It seems that you can, now you just need to find the right clientele. Print out several good quality copies of your portfolio and take them to every interior designer and boutique home store in your area, tell them you can build anything and that this is a sample of your work. When they call price your shop rate at what it should be for your area if you rented a shop and you're off.
Enter every regional show and competition that you can, and cold call your favorite woodworkers asking to come see their shops(when you turn 21 bring a six pack of good beer) or if they need a motivated assistant. Don't listen to naysayers. Be romantic and passionate about your craft. Go to Penland or Haystack for a few weeks. Need a rec. for the app? I'll write you one. Above all else, accept nothing less than perfection in your work. Do these things and there is nothing standing in your way.