I do the same thing! I sometimes think I just can't take criticism, but I've realized that really I just don't do well when the criticism blind sides me. If I know I am not doing my best and it is pointed out to me I am ok with it, but if I think I am doing well, or am falsely blamed for something, I break down instantly! I am also super sensitive to things my friends do or say. I cried just yesterday, because my friend hadn't answered my calls in a couple of days. To me that was like saying she didn't want to talk to me... it didn't, in the moment, occur to me that she might just be busy.