Most of us have walked away from a drill or exercise dissatisfied with the outcome or an aspect of how our skills were exemplified. If you haven't then you must be a prodigy when it comes to shooting, or maybe you haven't had the opportunity to train much yet. Whether you have a bad rep of a drill or not, there are always different learning points and attributes that can be focused on every time you start shooting.
A common issue with those training is the idea that a failed training rep is a wasted one. Even if you do not complete a drill or goal in the allotted time/score and "fail" it, this does not mean it was a waste. Everyone starts at a certain point and improves at a pace of whatever they put in. A failure gives you a point to index from and find errors that will lead to improvements. Gauging your improvements from a personal point of reference, the mentioned index, helps a shooter track their abilities and observe what went wrong.
Another issue that is commonly seen at the range is starting a drill over if something doesn't go as planned. This means stopping the entire drill because of a mistake and only doing the drill perfect. There is a time and place for being perfect, but humans learn from failure. You are doing drills to improve your skills and make you situationally better. Not every situation in real life is going to go as planned so you have to be proactive instead of reactive and overcome small errors.
For example, let's say you start a drill and completely mess up the purchase on your handgun while drawing. You can't go back in time and make up that error, so you might as well utilize it as a training point instead of standing there and resetting your shot timer. You would be able to work on your recovery skills in this situation.
You must push through mistakes while training because, as you should know, life does not provide a redo button- especially in self defense situations. The quicker you can react to dynamic situations, the better.
So maybe your errors and "failures" are not as bad as you think. Not only do they give you an index to base your training and growth off of, but they also provide you with a real life scenario because not everything will goes as planned. Your range sessions are going to be in a simulated environment where many times the training is stagnant. Work now to break away from this and push through errors because life is full of mistakes, and just because you could do it correctly once does not mean you will always have the time and chance to make this happen.
Training comes with errors- they are inevitable and vary greatly, but choosing to utilize your errors instead of dwelling on them will set you apart in the shooting world. Your skills will truly progress and you will know the exact areas that you must work on. Many people do not utilize every form of learning that comes to them. Push through your drills and make sure you find your imprivement and utilize every single rep that you make. You cannot take back the time and effort you put into shooting, and you can't take back the bullets you shoot, so you might as well make it all count in one form or another.