You could need a heavier putter. True story:
I have an adjustable-weight putter (Mentor Sports Triad 2). For most of the season, I have it weighted EST (empty slot, steel weight, tungsten weight). I took the weights out at the end of the season as the greens had gotten a little shaggy. I couldn't putt for beans - like Neil said, I was afraid to pull the putter out. Put the weight back in (on?
) and there she was again - laggin' 'em close and knockin' 'em in.
Tell yourself you're a good putter. Visualise the line, and the ball rolling into the hole. Then just do it.