It is vital to focus on your present shot, and not still be brooding over your last bad shot.

Having the right mental attitude to let the bad shots go and get on with preparing for your present shot will give your game consistency and build confidence.

 "The only shots you can control are the ones you haven't hit yet"

Visualising your best game.

Research shows that when you visualise or imagine yourself playing your best game the same neural pathways in the brain are fired as if you were actually playing for real. By learning how to visualize your best game you will increase your effectiveness and success. You effectively practice just by the act of visualisation.

Visualisation is like doing a dress rehearsal of each stroke, from your drive through to your putt and is used before, during and after the game. 

Confidence comes from recalling past successes and having a relaxed, easy attitude to your golf.

A very good way of building confidence is by making your practice more difficult than the actual game so when faced with a game or tournament, it will seem easier than your practice and it will give you the confidence to succeed.