I too have recently had my hair cut- it was level with my bra strap. I wanted a jaw length choppy bob- I have a choppy bob cut right into the back of my neck, and just past the bottom of my ears.
I love it, but in reality I should have kept it longer until the weather got warmer, as I'm just so cold all the time. Luckily I have a lot of scarves to wear to keep my neck warm, and a plenty of hats to choose from when I go outside. The Mums at school think I hate it and that's why I'm wearing the hat- it's not it's just too cold for short hair.
It will grow, I had mine done a week Saturday and already the back is loosing it's 'sharpness'.
It does take a while to get used to it though.