Believe it our not, most amateur golfers don't really aim their putts at the hole, they aim their bodies. That just won't work. The ball will slide off to the right (if you're a right hander).
Remember the train tracks: the outside track is where you want the ball to go. The inside track is where your feet are and the tracks need to be parallel.
Pull out your alignment sticks on the green and aim your putt!
Enjoy the game again,
P.S. Trying to get more "I Golf, Therefore I Am" books for new members!