No, don't worry. I am a teen and I weigh 8.9. As a teenager, you are still growing and are fine. Just don't go overboard with all the junk crap and eat healthy, always include some sort of fruit and veg in your meals, trust me. And always eat breakfast. You need it. It is extremely important and keeps you going throughout the day, don't worry. It's fine.
17.8 stones
89 kg = 14st 0.2lb
20 US stones is 250 pounds.
89 kgs
15 stone
34.57 stone
79.8kg = 12.6st
89kg = 195.8lbs & 13.98 stone
71 kilograms = 11.18 stone.
2.5tons
they built it out of heavy stones and logs
95 kg = 15 stone.