Hi Clare!
I wish you were new to dieting too! You are right that obsessing about calories seems to be a birthright for women, but it shouldn't be.
It sounds like you have a pretty good perspective on it, though. I wish I had been as aware of my health at your age - I'm in my late 20s now, and I think of all the damage I've done to my body and psyche that I could have prevented!
Anyway, glad to meet you, and hope to see you around!