i would say confidece comes from any 5-10 minute period in the game.
you MUST go looking for the ball and find a pass and keep doing it.
you need to feel good about how you are playing and the rest will come
if your right footed im guessing your following through too far and are not counterbalancing it if the ball is floating off to the right tilt your right shoulder back on your follow through this should straighten the pass up
Honestly i dont think you should be playing centre mid. sorry to play there you always need to be confident in your abilities and you must always want the ball and be able to pick a pass everything goes through you find another position or just play with more confidence your choice