Hey I'm 51kg n 21 year old guy having height 5'10''... But the problem is that I'm skinny even though I eat a lot.. So if anyone professional can give me some advice it will be helpful.. I really do want u to have perfect physique.. So please please help me out..
Check out bodybuilding.com and their body building app. Tons of great articles, workouts, support geared towards getting bigger.
There's a topic in the forums called Want to lose or gain weight that's great, check it out. What "morph" are you on different body types is good too.
Dude you need to start weight training. It will give that pump to your muscles and then to recover they need protein, which once the requirement is satisfied you will gradually start noticing the increase in size. It will take time but don't give up