Commit

Commitment is one of the most important mental aspects of the game of golf.  A lot of people go through their routine, routinely.  Your routine is good for keeping calm under pressure and being consistent.  If you're not completely one hundred percent committed to your shot before you hit it, then you might as well not have done your whole routine.  When I say commitment, I mean believing in yourself.  Unless you have a caddy, you are the only person who is judging what to do on each shot.  If you don't truly believe your judgement is good, you won't trust yourself.  You simply have to believe that what you are doing is the right thing, no matter what.  Don't think you're the only one either, because pros still have commitment problems, too.  If you can learn to trust your judgement and commit to each and every shot in your round, you will notice you stop leaving those 5-foot birdie putts short or you won't chunk or flub any of those intricate chips.  You simply have to follow through with your mental plan for each shot.  When you are committing to each shot in your round, you should be following through with your line that YOU picked.  Trust yourself, you have most likely been playing golf for a long time and probably hit that shot a few times anyway.  It's not that hard.  Commitment leads to acceleration through the ball and more consistent shots or putts on your line.  Just believe in yourself.  After all, golf is just a game anyway.

Bonus picture of my almost hole in one:
(check the divot)

   @ Briery Country Club in Keysville, Virginia, USA