It takes skill and practice to project a completely different mental state without being seen through. Here are some tips: 1. **Observe and imitate**: Observe carefully the characteristics and behaviors of the mental state you want to project. This includes words, body language, facial expressions, and reaction patterns, and then incorporate these characteristics into your own behavior. 2. **Act confidently**: Believe in the role you are playing. When you confidently project a certain state, it is less likely that others will doubt you. 3. **Control details**: Pay attention to details, such as the speed, tone, and word choice of your speech. Adjusting these can help you project different mental states more realistically. 4. **Transition slowly**: If possible, gradually switch states rather than suddenly changing them, which can reduce the risk of attracting attention from others. 5. **Adapt to the environment**: Adjust your performance in different environments to ensure that your behavior meets the expectations of that environment. 6. **Emotion management**: Learn how to control your emotions and ensure that your true feelings are not revealed on the surface. 7. **Adapt to circumstances**: Be prepared to deal with other people's doubts and think of appropriate explanations or reasons in advance so that you can speak them naturally when needed. 8. **Continue to practice**: Practice in a safe environment and gradually improve your performance skills. It is important to note that in any situation, it is very important to convey a message of truth and integrity. Acting out different mental states should only be used in specific situations and ensure that it will not cause any harm or misunderstanding to yourself or others.