Wow, Mouse, what a thing to learn. I don't think it gets solved all at once or completely but telling/talking to your therapist when she gets back should help a lot. I have a sort of similar story.

My aunt, my father's sister told me that when my mother was in the hospital and was operated on, brain surgery, they opened her up and then realized there was nothing they could do, she was going to die. My aunt says my father and she were talking one night after my brothers and I were in bed (I was just 2) and my father said, "If we had known that, we wouldn't have had Perna." I've worked very hard to reframe that to mean, "We are so glad we didn't know or we wouldn't have had that wonderful child" :-) but I'm sure you can see what I actually thought. I don't think people will laugh at me but I'm sure uneasy about whether they want me around!

I hope your T says something "just right" and wonderful to you when you tell her what you've figured out; something that will stick with you so you can remember it when you're feeling people might laugh. I have over time figured out I'm "stronger" than my feelings so I do stuff anyway and get more experience with people "enjoying" me (my husband's wonderful expression) and knowing that I really don't care what the "masses" of people in the street think of me, I have the good friends and relatives, the people I truly like and they like me back and the relationships over time are comfortable.