When someone lets you down or says something hurtful it is magnified times ten.  Words and actions are taken personally and to heart.  You know you need to take a step back and think carefully before you act irrationally.  The first instinct is to lash out or take the opposite approach and retreat into yourself and allow whatever happened to affect you deeply.   Learning to remove yourself is a tremendous feat.  As per, you blame yourself and react before you have time to get details or talk it out.  This can be mistaken as a meltdown or acting immaturely.  You KNOW this but at that moment you are not able to react appropriately.  Remove yourself, extract yourself or just calm yourself.  Do not think about what others are thinking, for once think about YOU!  

Do you wonder when or if this behavior will ever end allowing you to brush things off like your peers?