"My mistakes today prove that I am a failure.” – This mindset will drive you and everyone around you crazy.  Finish each day and be done with it.  You have done the best you could.  Some blunders and absurdities no doubt crept in; forgive and forget them as soon as you can. Remember, your failure does not define you, your determination does.  Failure is simply the opportunity to begin again, smarter than before.  Tomorrow is a new day.  You shall begin it peacefully and with too high a spirit to be encumbered with old nonsense.