Starfish! I think it's really good you vented!! That's how it feels after talking things over with your T! It's good! Therapy is the best you could do for yourself honesty! If you feel you could not talk about cutting initially that's ok, whenever you feel comfortable, it's up to you. No big deal when you are ready. My T knows I really don't want to stop (as you mentioned) but T wants me to stop for health reasons so we have found many coping mechanisms that work for me.
It's hard carrying a huge burden all by yourself (obsessions, secrecy), ask for some support, you'll feel so much better and on to an incredible life.
Good Luck & Let us know how You are doing! Keep in Touch!!