Alright I need help

I’m having a bit of an anxiety, panic attack. Tomorrow is my meeting with the therapist and i dont know what to say.. I’ve gotten so good at saying “I’m fine, thanks for asking” I dont know how to be open. should I tell her about SI the first time? what should i say/not say?

Just as an update, I think my parents are more aware of whats going on than i thought. last night my mom and i were talking about friends and she said out of the blue “Well i’ll tell you this.. these girls are not worth (injuring) for and if i here thats whats happening then we are going to have some major problems.” Kinda shocked me.. I dont know.

Okay so any advice on therapy would be appreciated! Hope you all are well!