Uhh, I'd have to find a converter to help you DT but I think average weight in pounds for a 5'4" person is around 135? (I may be guessing a bit heavy.)
I just found this simple converter for you, too.
http://www.metric-conversions.org/weight/pounds-to-stones.htm

I really need to get out and do some exercise too. I bike to school everyday but my downfall is snacking. I need to stop snacking and stop just sitting infront of the computer and go out and do something. Be active.

Maybe we could start some health support group in here since it seems like a lot of us want to lose some weight, get healthier in general. xp