When I am practicing I hardly ever miss a shot. Whether it's a 60 degree cut length of table, a cross side bank, a length of table bank, everything goes like magic. I practice the shots that give me the most trouble. Piece of cake, I make them and I never ever will miss again.
So, it's league night, and I'm matched up with what I consider a lesser player. Another words, he/she doesn't posses the skills that I have. It's a race to 5 and before I know it this guy/girl has me 3 - 0. WTF, how can this be. I never miss a shot when I'm practicing. Now, I'm missing the easiest of cut shots. How can this be? I eventually lose 5 - 3.
Has this ever happened to you?
In analyzing the situation, the first mistake was sizing up your opponent. You embedded in your mind that you couldn't lose. It's very easy to find yourself behind, opponent makes the 9 on the break, you hang the 9, or your opponent makes a combo on the 9, irregardless, you find yourself down to this lesser player. You start thinking I can't let them beat me. You start missing shots that you purposely practiced. You start taking deep breaths, you take a little longer to chalk your tip. You are starting to think about everything but just playing pool in a relaxed manner. On a scale of 1-10 on a tightness factor, you probably register a 9 or a 10. What are your team mates going to think of you losing. By the way, you haven't lost yet, but you are already thinking of it.
I could go on and on. Why the hell do we do this to ourselves? I eventually lose the match. The next day, while practicing, I continue to make every shot.
Will someone please tell me how to control this type of behavior?
You stated the reason this happens, but you didn't "hear" yourself say it! What you are doing in practice is a different game than when you play in competition. And, they shouldn't be.
In practice, you play the table, period. You see what you need to do, and then focus on doing that. In competition, you shift your thought process to not playing the game as you have trained, but to beating your opponent. You look at your opponent, and think "oh, I have him beat", and, now, in your mind, the game is already over. So...your mind is no longer there to actually play the table, no need to, you already won.
All you have to do is play like you practice. Forget your opponent, forget the match. Just play the table, put your focus in the same place you do when you practice.
You can not play to your abilities if you place artificial priorities on yourself. If you are thinking, "this guy is tough (or easy)", "I must win this match", then your focus in NOT on your play, but on the outcome. You are actually sabotaging yourself and the outcome by thinking those things.
You practice, or properly worded, train, to perform a certain way in actual play. Just do that. Perform the way you trained. Focus the way you trained. Only then can you "release" yourself to play to your actual abilities.
The same goes for the attitude of "I have to get out here, or make this shot, or I will look like I can't play". Artificial thoughts to sabotage yourself. Those thoughts go right to your subconscious, which is what actually performs the shot. Your conscious tells your subconscious what to do, and then your subconscious performs what it was told without any concern about the results. Results are a conscious thing.
If you have fear of missing, you just told your subconscious to miss, and it will find a way to do exactly that. If you tell yourself "this will be an easy match", you just told your subconscious that it doesn't need to apply itself very much. It can get a little lazy because it won't matter. Well, the game is actually hard enough that if you get a little lazy, you will miss. Then, you start a chain reaction. Now you are concerned because you just missed that "easy" shot, and think everything is going downhill. Guess what, you just told your subconscious to go "down hill", and it will do exactly that.
Train like you want to perform, and perform like you train.