There are way too many variable to make any meaningful judgement about your average speed. Before you race you need to do some group rides with the fast group to start to develop the bike riding skills necessary for racing.
How well you hold up in competitve group rides will tell you more about where you're at and what you need to work on, than we can hope to on line.
That said, my bet is that you've got some work to do before you'll be able to hang, but that you'll improve quickly.