I also wanted to say that you shouldn't let a few tenths of mile discourage you. I know it's disheartening to find that even though you've been working so hard, all your hard work isn't adding up to what you thought it was. That sucks, no question about it.

BUT you HAVE been working hard and learning more and feeling better, right? Focus on that. Keep working on getting more comfortable on the bike, and doing your regular rides, and the miles will come.