1. no of course you aren't too young to be attracted to .. anyone. you're attracted to whomever you're attratcted to.
2 a: try to remind yourself when you feel her 'leaving' what is real. is she really? or is this a thought in your mind and only a thought?
2.b: give your frantic response to your fear some room and time. see 2a
3. therapy is about you and how you feel. your mom is your mom, but she doesn't know how you feel inside; that is yours and yours alone. therapy isn't something you pass or fail, and hearing her ask 'how' you're doing must feel like you are being graded, rated, judged. can you talk to T about how you feel about her talking with your mom?