Was there a book that could change people?

I'm a girl, introverted. I was often punished by my teachers when I was young. When I went to work, I was always submissive, afraid that I wouldn't be satisfied with what I did. When I asked the supervisor questions, he looked very annoyed (my current job is a warehouse clerk). I didn't even dare to ask. My temper was okay, but I was easily anxious. Most of the time, I would still keep the unhappiness in my heart. I don't have any opinions, and I'm introverted. I don't have a sense of balance when I do things. I feel that I'm full of shortcomings (the lady boss also said so). I want to change myself, but I don't know where to start. I also want to do it well, but every time there are too many things, I will lose my direction. Others say this is important and put this first. Another person says his is also important and he does it first. I don't know what to do.