I'm sorry you're feeling down, Tongalee
I think it's really brave that you can talk about this stuff with your T at all, especially how you feel about yourself. I can relate to that, but am nowhere near letting T know yet.
I wonder... you said that you want to agree with her and believe her... but you can't. Maybe you don't have to yet? Instead of trying to just instantly change your perception, can you think about it like this... "I don't know if my T is right. She may be right, she may be wrong." - i.e. don't believe her 100%, but don't *disbelieve* her either. To me, that's what making room for the idea is...