It would be classed as ghost ball. Its how many people get taught when starting out, but its very basic and relies on previous experience usually to use it effectively. It may be that you are visualizing shots correctly but not producing a good enough stroke. If you can't send the cue ball down table and back up in a straight line and have it hit the tip of your cue you have to realize you are going to miss shots, sometimes lots because of this, no matter if you visualized the shot correctly or not. See if you can do this 10 times in a row, until then you will miss even if you visualize and set up correctly on shots.
People tend to get taught how to aim before having any real form of straight cueing action. Can I ask how long you've been playing? I would say for anyone playing over a year they have hit enough balls to have 80% of shot angles and ball positions etched into their memory. Most who have been playing for 3 years plus will only need an aiming system to utilize as a preshot routine and on difficult shots such as those where the pocket isn't in the line of vision. So it may be that if you've been playing long enough you might over thinking some shots, when it may be better to just go into auto pilot and send your mind elsewhere. That being said...try the cue ball up and down table drill 10 times and let us know how many times it comes back up table and hits your tip.