I so relate to this. My old psychiatrist told me I need to stop taking such rejections (or perceived rejections, in some cases) so personally...but I can't stop the hurt I feel from it. Being left out of anything feels so horrible. For instance, my boyfriend was invited to hang out with a group of friends for one of their birthdays a little while ago. I wasn't invited because I haven't met them, and it was kind of a "guys' night out" sort of situation, which is completely understandable. Nonetheless...I felt hurt and couldn't stop thinking about how much fun they're having without me, and unrealistic beliefs that his friends don't even want to meet me since I wasn't invited. I especially got jealous later when I heard they were drinking a little without me.