Well I'm 17 in 20 days and I'm also 5ft 11 and I weigh 13 stones (182lbs, 82.6kg) although I do have a bigger build than almost all my friends.
I can bench 52kg (10-12 reps) if this helps...
ten stone
120lbs
175
125-135lbs
What_are_some_frequently_asked_nutrition_questions
90 pounds
About 80 pounds
about 100-115
160 lbs
All I know is if you are 5ft 7" and 19 years old your ideal body weight for an average build is 135lbs so im sure 5ft 8" is just a little more mabey 140ish ?
65-80 pounds
45-55 kilos