Hayley, 117 pounds for a 14 year old is not at all bad! That is probably a perfect weight, or maybe you could even use to gain a few pounds [I'm no expert!] My guess that by being 117lbs you certainitly don't look fat, so I wouldn't be concerned at all. I don't even weigh myself anymore, hte numbers are horrible, I base it on how I look, because like Brit{vballqt} said, she weighs near 140 but its muscle not fat, therefore she looks fine and skinny for being that weight.
Don't worry so much about you weight, if you were 14 and 217lbs then you should be concerned. Just live life, don't step on the scale, worrying too muchh will lead to problems that you don't need to deal with. If you want to be a healthier person you can run, get in shape, tone your muscles and eat less junk. No dieting, just be healthy.