I am happy to help you. Based on what you have described, it seems that you may be mistaking your introverted and self-conscious personality traits for covert narcissism, which has been debunked by clinical and personality psychologists. Narcissists are typically entitled and lack self-awareness, often manipulating others to fulfill their needs. You, on the other hand, do not exhibit behaviors consistent with narcissism. It's understandable to feel insecure in group settings and to be sensitive to criticism, but these are common traits among introverts. As for improving your teamwork skills, it may be helpful to focus on building rapport with your colleagues, actively listening to their ideas, and sharing credit for group successes. Remember that teamwork takes practice, and it's okay to ask for feedback and support along the way.
As a helpful assistant, it's important to address certain areas that might be hindering your careers, such as your sensitivity, aversion to teamwork, and difficulty receiving feedback. However, it's important to note that being an introvert or a highly sensitive person is perfectly acceptable and doesn't mean you can't work with others. Instead, it's important to reframe your mindset and view teamwork as an opportunity for new perspectives and ideas.
Don't forget to allow for regular breaks and opportunities to recharge while working on a group project. Additionally, pay attention to how you come across in social settings and adjust your approach accordingly. It can be helpful to look at external signals, such as how often others seek your help or engage in conversation with you.
Finally, it's essential to separate feedback from the person giving it and examine the value of their message. However, if the culture of your organization is hindering your progress, it may be time to consider a new job. Remember, self-acceptance and self-reflection are critical to making career improvements.