When you listen to your inner voice, is it mean to you? If so, you're not alone. Many people go through their days hearing an internal litany of self-criticism. The problem, of course, is that it's hard to get anything positive done at work while you're tuned into negativity.
Do you feel like a fake? If so, you might be suffering from impostor syndrome, the feeling of intellectual or professional fraudulence that manifests as severe self-doubt. Even when all evidence indicates that they are competent, someone experiencing impostor syndrome can't shake the feeling that they don't know what they're doing professionally, and that soon enough someone is going to find out that they're faking their way through their job and they'll be fired.