ANDY'S ANSWER: Well, most of the time it's just a pecularity of the way you were put together. In other words, yes it's likely normal and nothing at all to worry about. Some guys just have a natural bend in their penis.
If your penis is really crooked and bends sharply to the right or left, and especially if there is pain with an erection, there is a possibility of Peyronie's disease where scar tissue builds up in the penis. The only way to know for sure if that is the case, is to have it checked out by a doctor.