hi young man , good to find that u are health conscious, first let me clear that your perception about good health and body need some modification,gaining wait solely is not criteria of good health at all,
from medical point of view at your height your weight should be 52kg to 73 kg considering your height 1.70 cm and you need not to worry at all about this at this tender age
as far as cosmetic purpose again gaining weight again should not be your priority ,what general perception in domain of body building is muscular body in good proportion .I mean to say is that each and every part of your body should have proportionate growth and definition of muscle and should not be out of proportion,
endura mass or other high protein diets are called supplement, that means it is in addition of normal or enhanced diet not substitute of your traditional diet , so solely taking endura does not work,always keep this in mind
Now coming to the point ,gaining weight by gaining muscle is very complex and time taking process that need meticulous planning .you need close supervision of professional trainer and dietitian for this ,however in short let me tell you that u need to take 5 or 6 small meals with good blend of protein and carbs and fat , and need some weight training and rest all in specified way otherwise taking only endura or other supplement is wastage
Generally people of your weight and height should take 120 to 150 gram of protien divided in 5 or 6 meal with 3 times carbs and amount of fat little less than protein in every meal, with moderate exercise and full rest
hope you will be satisfied by this answer