I would think it unusual if your mind didn't wander! If anything, you're perhaps ahead of the game by realizing how much your mind is wandering. Of course, this happens to varying degrees for people and it can sometimes be a symptom of depression, attention-deficit disorder (ADD) or other health problem, so check with your doctor if you think you're wandering to an unusual extent.
In mindfulness there is an analogy of "monkey-mind": our minds are constantly chattering away at us like monkeys. This isn't atypical or anything to worry about; it's simply something to become aware of in order to manage it more effectively - once you recognize this chatter for what it is (simply that - chatter), you can use mindfulness and other skills to help you reduce the amount of chatter, and to prevent your mind from wandering so much.