Reason: 1. No practical experience.
2. No social experience
3. Lack of basic understanding of the industry.
For the above reasons, the work is too difficult.
Lecturer post is mainly to train new and old employees. Explain the terminology. Encourage staff morale.
According to my experience, the position you can get should be a business person, not a lecturer. As a newcomer and inexperienced, what is the persuasiveness of what you said?
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.