What lengths do junior girls K2 snowboards come in?

I'm looking to buy a new snowboard, im 15 years old, 5'3 and about 110 pounds. Please correct me if I'm wrong, but I think i should have around a 142cm board, right? My last one was 144, and I found it too long. I'm an intermidiate rider, I'm starting on 180s and I definitely like jumps and carving. Anyways, I was wondering if I'd fit in junior boards?