Yes, those little, quiet, nagging voices are awfully powerful if we allow them to be. I battle them daily as well. I think it is ingrained in us as children to not brag on yourself, not think highly of yourself, and so on because so many people do it badly. However, there is a need to be confident enough to say, "I am this and I am good at it!" Good for you standing up to those tiny voices.
Ren