Hi Jay,
I think everybody worries about that from time to time, and there are periods in which this happens more than others, so maybe you shouldn't stress about it by thinking of it as an anxiety disorder for now.
Yet you should keep it under surveillance so you can take some action if it's not just a self-doubt phase (going through a bit of an "identity crisis" is actually healthy at some life stages) and it becomes a problem.
Also, check if there are some personal issues unresolved. If there are and it becomes a problem, or if it's a problem already, seeking professional help would be wise, the sooner you'd tackle it, the sooner it would be sorted. See if there's something about that you'd like to talk further, there's lots of good advice here, people who can help you coming to terms with that.
Good luck, and welcome to the forum!,
lenny