Self Doubt

Well, it's about that time of year when self doubts comes creeping it....this happens every year.
I question whether I am cut out to teach children, whether I can do as good a job as I would like to...
Who am I anyway to teach these children?  Surely someone else is more qualified...blah blah blah...

Oh I hate this when this happens!  I am a wreck the first day of school...so nervous like it was my first day ever...gah!

Am I the only one that goes through this?  I would think after 9 years of doing this I would be more confident...or something.....