training wheels?

I have been really inconsistent with the whole blogging thing... but I have also decided that its OK.  I knew going into it that I would have slumps.  That aside, I have been teaching now for a year and a half and I feel like I should be doing better.  I think I'm starting to understand the ugly statistic of teachers quitting within their first 3 years as opposed to just the first year.

I am not giving up or wanting to quit... in fact I still love my job.  But I get frustrated that the learning curve isn't faster, I am impatient.  I feel like I should know what I'm doing by now and I don't.  I am sort of used to being seen as a teacher... and I am pretty comfortable in a classroom... and I am much better at making lesson plans... but sometimes I think I still have on training wheels.

I am trying to come up with a scenario to describe what I mean, but I think it is more of an overall impression that I have.  What I am missing is one part knowledge, one part responsibility/organization, and two parts confidence.  That would be the perfect recipe for me to yank off those pesky training wheels.  Unfortunately, I can't convince myself to have more confidence... and its not the knowledge of my ability or talent either, its the application. 

I am nervous talking to certain students because they have been discipline problems in the past, I dread explaining topics that I find hard to teach, I worry too much about every little detail of what I say to the point where I am so concerned with how I am saying something and not so concerned with how the student is hearing it.  I am particularly thrown off in my one class where I have had a lot of discipline problems in the past.   Is this a normal feeling for teachers??  What can I do to make it go away?? 

~~~impatient senorita~~~