Yes- This is my dd12 as well. It drives me nuts. She is not bad at anything academically - but she will hold herself up to some completely impossible standard and then say - "wow - I really suck at this". I have absolutely no advice other than to say "I hear you". Logic does not work. I can pull out standardized test scores and show her percentile rankings... and say "see you don't suck - really- by any objective standard, you don't suck" - but logic does not seem effective.