Fred dislikes the idea going into the ministry partly because he doesn't like "feeling obligated to look serious", and he centers his doubts on "what people expect of a clergyman".
Fred has reservations about pursuing a career in the ministry primarily because he is uncomfortable with the expectation to appear serious at all times. He feels that this role demands a certain demeanor that he finds unappealing, indicating that he prefers a more relaxed approach to life and work.
His uncertainties also stem from his concerns about societal expectations of clergymen. Fred grapples with the pressure to conform to a specific image and the responsibilities that come with that role, which compounds his reluctance to embrace a path in ministry.