Self-awareness and self-reflection.

Traders often become acutely aware of their mistakes and shortcomings but may find it difficult to prevent or rectify them. This awareness can lead to frustration as traders realize their errors but struggle to control their actions or emotions effectively. 

Here's a breakdown of this concept:

1. Increased Awareness: As traders gain experience and become more engaged in stock trading, they naturally become more aware of their mistakes, suboptimal decisions, and areas where they could improve. This heightened awareness can result from a deeper understanding of the market, regular self-evaluation, or learning from past trading experiences.

2. Inability to Stop Mistakes: Despite being aware of their mistakes, traders may find it challenging to stop themselves from repeating these errors. This can happen for various reasons, including emotional responses like fear, greed, or impatience, which can cloud judgment and lead to the same mistakes being made repeatedly.

3. Frustration: The awareness of making mistakes without being able to prevent or correct them can be extremely frustrating for traders. Frustration can stem from the gap between knowing what one should do and not being able to execute it in practice.

4. Common Mistakes: Common trading mistakes include overtrading, ignoring risk management, chasing trends, letting losses run, or panicking during market downturns. These mistakes often result from emotional decision-making or a lack of discipline.

5. Improvement and Learning: While this process can be frustrating, it is also an essential part of the learning curve in trading. Traders who acknowledge their mistakes and work on addressing them are more likely to grow and improve their trading skills over time.

6. Discipline and Emotional Control: To address this frustration, traders need to focus on improving their discipline and emotional control. This may involve sticking to a well-defined trading plan, setting strict risk management rules, and avoiding impulsive decisions driven by fear or greed.

7. Continuous Self-Reflection: Successful traders regularly self-reflect and adapt their strategies based on their awareness of mistakes. They use this awareness as a tool for growth and refinement, aiming to minimize future errors.

In summary, becoming aware of one's trading mistakes and not being able to immediately stop them can indeed be frustrating. However, this recognition is an essential part of the journey toward becoming a more skilled and successful trader. The key is to use this awareness as a catalyst for positive change, working on discipline and emotional control to minimize the repetition of those mistakes in the future. Over time, with dedication and a commitment to learning from past errors, traders can improve their overall trading performance.