Sometimes things simply do not work for a person in a particular organization at a particular time. It can happen to anyone. The thing to do and the hard part, is to not blame anyone including yourself that it didn't work and to just get out. Try to do it amicably. Move on and don't look back. A large part of how all organizations work is simply luck and happenstance including how well people fit. You will find another job that works much better... and don't call me Abby.