When I say to people that I want to be taller, they always end up asking why I would want to be taller and this question annoys me a lot. It's not like I'd get taller by answering this question. But I could easily answer:
1. Perceived image
The simplest and probably most important reason is that I want to be simply perceived as an ideal male height by others. I don't want people to look at me and the one of the first things that come to their mind is that I'm short. Why do you think Clark Kent and Bruce Wayne were made to be 6'2"-6'4". Because these characters are so much associated with perfection.
2. sexual attraction
Probably the #1 problem of short men in general, they're worrying about being sxxual unworthy. Well, it's indeed a problem. "But hey, I know a guy that's 5'1", he's married and live happily". It doesn't change the way that he's still unattractive.
3. Physical superiority
Taller people have longer reach. If a guy is taller, he's most likely heavier and mass x felocity = force. Heavier guys always have the potential to hit harder depending on whether they train or not. No matter how hard I train, I will never be as strong as if I was taller and still put the same effort into training.
I'd like to think that I'm just 20% of what I could have been if I was the height I believe I was supposed to be which is somewhere around 5'10" and will always remain that way. And I'm now 5'5.75". Because 5'10" is ideal perfect height, but now I fall into short category. A world difference.