This is where you will win the battle - in the playhouse of your mind.
It is no exaggeration to say that every human being is hypnotized to some extent either by ideas he has uncritically accepted from others or ideas he has repeated to himself or convinced himself are true. These negative ideas have exactly the same effect upon our behavior as the negative ideas implanted into the mind of a hypnotized subject by a professional hypnotist.
Live in the present. The past is gone; the future is unknown -- but the present is real, and your opportunities are now. You must see these opportunities; they must be real for you. The catch is that they can't seem real if your mind is buried in past failures, if you keep reliving old mistakes, old guilts, old tragedies. Fight your way above the many inevitable Traumatizations of your ego, escape damnation by the past, and look to the opportunities of the present. I don't mean some vague moment in the present -- next week or next month, perhaps. I mean today, this minute.
Failure feelings - fear, anxiety, lack of self-confidence - do not spring from some heavenly oracle. They are not written in the stars. They are not holy gospel. Nor are they intimations of a set and decided fate which means that failure is decreed and decided. They originate from your own mind.
Happiness is native to the human mind and its physical machine. We think better, perform better, feel better, and are healthier when we are happy.
Happiness is simply a state of mind in which our thinking is pleasant a good share of the time.
When you see a thing clearly in your mind, your creative "success mechanism" within you takes over and does the job much better than you could do it by conscious effort or "willpower."
I am a firm believer in 'negative thinking' when used correctly. We need to be AWARE of negatives so that we can steer clear of them. A golfer needs to know where the bunkers and sand traps are - but he doesn't think continuously about the bunker - where he doesn't want to go. His mind glances at the bunker, but he DWELLS upon the green.