You rock. All I can say is that as long as you tick to it the miles pass by realy quickly. My first real ride (last year almost 40 lb. ago) as 10 blocks. I felt like I had ridden the TDF. The next major hurdle, riding to work (6 miles each way). Then there was the 20 mile, the 50 mile, the 100 mile marks.
Then it was the I've never climbed this place or that place.
Just keep it as your thing and keep it fun (advice from BF also helps a lot) and the rest will follow.