well, the first thing thats obvious is that you are short. Second, you have very little muscle development. And lastly, you have low self- confidence.
To answer your questions dont worry about your height, be as big as you want to be. I get the vibe that you are trying to get big either because you feel you get no respect at your current height or size, And you think all the sudden if you become bigger you will be more intimidating to people and get more respect. That is false.
First off you could be 5 foot 2 and still be intimidating. Intimidation is more about the way you carry yourself and the confidence you have. On the other hand you could be 6'2 270 but that person is a huge pussy and gets picked on all the time.
People with bigger muscles may be intimidating to some but as i said its about personality and the way you carry yourself. You think if you have big muscles you wont be challenged in life? you have to back it up too. Hell some people even look at bigger guys as a target for fights to test themselfs. Being intimidating is like being a badass, you cant only look the part. you got to show you are as well.
So to sum it up: stop being a doorstep and stand up for yourself getting bigger isnt going to change anything if your attitude and outlook on things are the same.