If you can't find the meaning and fun of your work gradually, you may want to reflect on whether you have tied the work and external rewards too tightly to forget your original intention and purpose. The happiness of work comes from the affirmation and desire of the heart. Carefully discover the fun and value of the work itself, and make learning and work become interesting things to "do for yourself".
The only relationship in the workplace is a working relationship, whether it's between a superior and a subordinate, or between coworkers. Whether that relationship is good or bad, it's all the same.
Strictly speaking, entering the workplace is the only way to really enter the society, not only to deal with work tasks, but also to deal with all kinds of interpersonal relationships.