2. Manipulative personality
Some managers can demonstrate qualities of manipulative behavior. This is particularly common where there is large power difference with regards to education or authority.
You are the reportee are anxious to make your boss happy and to prove your worthiness. You may find that you are saying yes to things without really wanting too. The problem is that this type of boss may not be looking out for your best interest but their own and so have you running off in multiple directions and not focused on your career goals.
In a way this feels like a compliment because you are taking care of so much and feel validated in your job. But it is important to know when it has gone too far and now you are not progressing in the direction you set for yourself. The most critical thing is to learn to recognize when it is happening and then to address the specific situation with your boss privately.
It may be uncomfortable if you are not used to speaking up, but you will develop great skills in managing others (managing up) and with a little skill and patience you can be sure to keep your career on track while still making the boss look good.