I have to say, I think you have a good work ethic, from the sound of your post.
I'm a graphic artist because I love the work. I started my career at the age of 29 and 5 years later it's still my favorite thing to do, besides writing. (Although writing is a million times more strenuous). I can work on a project 10 hours straight, if I'm left to my own devices. This makes making money a bit of a challenge, but I'm learning to not undersell myself.
In the end, however, I believe your enjoyment of the work will show. Your commitment to doing a job right will be remembered. You might be priced lower now, but building a reputation is a very important aspect of being a graphic artist, and people will remember your work. I think you have the right idea of how to price yourself. Again, best of luck - and I don't give up when things are slow.
