i also skinny since child. Now my weight is around 60kg with 177cm around, but all ppl still said i am still skinny. Fyi, i have gain weight from 50 to 60 in about 2 years time but have achieve 177cm around 5 years ago. I am still trying my best to gain more weight. I think the only way is only eat more eat more. -.- Try to eat whatever u can -.-