Too short?too strong? Too skinny?

I have a few question to ask I am 17 just starting on this website male I live in australia sydney I was born in afghanistan and lived in australia almost all my life My question is that my parents are short I wud that mum is 1.5 something and day is 1.69 to 1.70 I am around 1.63 which to me is very short for my age My brother on the other hand is 14 and is taller then by a few cm My question how can I get tall anyways ? Second question is that as you can cc from the picture below I am skinny I have a lot of muscles and times I few werid because they show up a lot On my arms near my elbow I have muscles poping up is that normal? Is ter way I can change that do it is still ter but covered up a bit due to the fact that iam very skinny it shows up? What can I do to get fat? Not fat as in get unhealthy but big enough to be tanked :) when I show my muscles you can cc my legimatments that is how skinny I am I need help I hardly exercises but I am a former thc taker (weed) I dont get to sleep much due to the fact that when I do all the problems in the world come in to my hard very hard to sleep when your thinking