Frustrations of a Teacher

I want to teach so badly. I have attempted to pursue this endeavor for what is going on 2yrs. It feels like every time I try something knocks me back down. Last year it was time spent as a long term sub and realizing just how far I was into the deep end. I have had training this year and thanks to the good folks at Tx Teachers my eyes are so much more open this time around the block. I guess as a Christian I do feel God has a definate plan for my life that through my understanding of his leading includes teaching. I just do not understand why it is taking so long to come to reality. My feeble mind does not see the end result that my Heavenly Father sees. Jeremiah comes to mind where we hear that God knows the plans he has for our lives. I feel like I am getting all my ducks in a row finally and pray someone out there is willing to give me a shot.