thinness

i am very thin my height is 6feet but my weight is 56kg i dont understand y i am so thin i tend to become weak when masturbate or nightfal i eat good diet nd this has effected me mentally too everyone who sees me always point out on my thinness i do go for workout ido exercise like of biceps,shoulders nd most important i do not have any flesh in my joint bones they see frquently for eg my arm joint bones so what should i do to grt rid of this problem

[thyroid man]

well if there is nothing medically wrong with u then u need to eat high calorie foods. U said your diet is good...well maybe it is too good. As far as doing workout for biceps and shoulders...forget about it. U need to do major lifts like squats and deadlifts to add weight too your whole body. U will never gain muscle if all u do is isolation type movements. U can gain a lot of muscle from just squats and deadlifts. Biceps curls will not cut it. A person can add a lot of size and strength too their whole body from just deadlifts alone. Also major lifts like that will increase your appetite so u can eat a lot more. How many calories do u eat a day? Probably not enough. Stop wasting time on bicep curls and shoulder workouts if your trying to gain weight.

[live4fitness]

You need to see your Dr. It sounds like you might be malnutritioned. I would not recommend you work out till you find out why you get weak at night and from your extra curicular activities. You are WAY to thin. Get help

[marstreis]

Make sure you are eating plenty of carbs everyday.  Here is a good bar that I always keep in my desk at work and have for a snack whenever I get hungery.  It is filling and good for you:
http://www.jigsawhealth.com/products/jigsaw-bars.html