Hello guys, I'm new to gym and want to build a nice looking body(male)....my body is ectomorph....height is 183 cm and weight is 70 kg...I want to increase my upper body muscle size because my chest is flat also my arms are so weak that I'm not able to do push-ups. The following is my diet :- 9am breakfast 12pm 4 boiled eggs(including the yellow part) 3pm lunch 5pm 2 glasses of banana shake 6pm I go to gym and 9pm dinner(sometimes with milk)......I'm thinking of buying ON 100% hop whey protein isolate but my gym instructor says me to take mass gainer....so confused....I'm worried about the negative side effects of these proteins as currently I'm 17 years and 10 months and the instructions given on ON whey protein is that it should be taken by people of age 18 and above....... Please guide me guys please!!! Genuine people are requested to reply who are having good knowledge