Wouldn't you think though, as a writer, that having a novel published and holding the finished article in your hands one of the best achievements - a personal success? Regardless of how many novels that you may have written?
I know that I didn't start writing or the publishing process with thoughts of J K Rowling type success. I did it because one, it's a superb and enjoyable hobby and two, because selfishly, I wanted to write something that I would want to read.
Having someone such as a publisher validate your work to the point of agreeing to publish because they think it has marketable appeal is awesome and a great achievement in itself.
If the book sells, all well and good. If not, what have you lost? Nothing. What you have gained though, is huge enjoyment in doing what you love.
I'm in the process of marketing my books as obviously any sales would be a lovely bonus and further validation on the work, but, if not much comes of it, so be it - it doesn't mean that I should think myself a failure, even if negative reviews were made. I'd learn and then possibly try something new.
Enjoy what you're doing is my advice and make no plans to be a career novelist!
http://www.peterjanes.co.uk