Hi Cali - I would say that that is slightly underweight so be careful not to go any lower. I am five foot two and weigh 8.7 stone and have done since I was about 14. Your weight sounds absolutely fine to me.
Wow, you're lucky. I'm 15 and 5'5 and weigh 9.5 stone. I'm not and i don't look fat, although there are some parts i would love to be slimmer, e.g stomach, thighs. But like lizw says, careful you don't go any lower.