Just a few more comments and suggestions Larry and then I'll be out of the Instructor Forum. I'm not an instructor and I feel uncomfortable posting here.
1. Before practice go to YouTube and spend 15min. or so watching the pro's play. I like watching Jason Shaw and SVB play mostly. Now when I watch these guys play I study their fundamentals. ( watching their feet, how they lead their body into the shot and how they stroke the cue ball (are they hitting the QB or pushing the cue thru the QB)
2. You said you play one pocket. Before going to your next match go to YouTube and watch Alex P. (spelling) or Eferen for an hour or so. Watching this will get your mind where it should be for your upcoming match.
3. You may want to add more structure to your practice routine. Back in '93 I bought Bert Kinister's VHS tape (yes VHS) 60 Minute Workout for 9 Ball and still, to this day, practice the shots daily. You will see the value of these shots and positioning of the QB when you play out in the field.
Recommended reading/viewing for One Pocket:
Scott Frost's DVD's
Tom Wirth's "A Game of Controlled Aggression"
Winning One Pocket
Shots, Moves, & Strategies
Tor Lowery's Video on Kicking
I may have missed few but these are the ones that come to mind.
Last comments. Whatever aiming system you use, just remember to let your eyes lead your body onto the shot line, not visa-versa. Watch the pro's.
The game is all about you and your desire to be the best that you can. Never accept that you can't be an "A" player or even better. You can, you just have to put in the table time. Hard work pays off.
Your not quitting, your hooked and you know it.
Have fun out there.
John