Hello Mr. keshav, Thanks for using healthcaremagic. Young man, just relax as you are not suffering from any pathological problem. Note carefully whatever I am going to explain. Normally after age of 13 or 14 almost all boys enters in to phase of adolescence. In this phase testosterone secretion increased, beard mustache growth started, hair around genitalia started growing and adolescent boys attracts towards opposite sex and gradually learn masturbation(excitation and ejaculation by sexual thoughts though rubbing penis by own hands). With this semen production (majority by prostate and sperms by testis) started. As semen produce daily and it accumulate in prostate.Its production generally cost 1-2 % part of your daily calorie intake,so missing 1 % from your whole day food has nothing to do with weakness you feel.It is just perception of yours. Your habit of masturbation is not bad at all until it s compulsion. As most of the young man like you do masturbation(almost 95%). Frequency of masturbation varied from once in a day to once in a week individually.You should not suppress your desire.If you completely stop doing this, after a storage capacity level exceeds in prostate, semen has to come out in night during sleep or during toilet. So just understand this physiology of body and correct your psychological belief of semen loss causes weakness. And yes height depends on genetic make up and heredity. Normally height increased up to age of 16 to 20 because after that bone structure can not grow.Exercises like running ,push ups,skippping might help. And your weight may be less due to your worries and may be false perception.So eat food like milk, fruits, pulses,eggs and put on some weight and it may help to increase your hieght. All the best..have good future ahead. Regards, Dr. C. K. Solankinki