As a young man, Abraham Lincoln went to war a captain and returned a private. Afterwards, he was a failure as a businessman. As a lawyer in Springfield, he was too impractical and temperamental to be a success. He turned to politics and was defeated in his first try for the legislature, again defeated in his first attempt to be nominated for congress, defeated in his application to be commissioner of the General Land Office, defeated in the senatorial election of 1854, defeated in his efforts for the vice-presidency in 1856, and defeated in the senatorial election of 1858. At about that time, he wrote in a letter to a friend, "I am now the most miserable man living. If what I feel were equally distributed to the whole human family, there would not be one cheerful face on the earth."
The change process takes time and does not happen overnight. Just know that the work you do now in terms of making conscientious walkthroughs, giving specific and timely feedback to staff, and using the resulting data to make decisions will provide your fruitage for improving instruction and student achievement in the classroom.