The experience of doing well at something does nothing to change your belief that you don't belong or don't deserve to be there. Every time you get more success it almost just reaffirms your ideas of being forward in the first place and it makes you feel almost slightly more uncomfortable. Serena Williams, Natalie Portman and Cheryl Sandberg have all admitted to this crippling imposterism so even though we are able to rationalise imposter syndrome and recognise our strengths we really still can't escape it.