I'm sorry, but this sort of thing is just ignorant.
no we aren't! We are a social species.
On average, in general. That does not mean everybody should be compelled to be "social" at all times with every random person they encounter.
If you are sat on a bus your "personal space" extends as far as the seat you are sat in. Another is welcome to use any other seat at any time as long as they don't sit on your knee you haven't any cause to complain!
No argument there. However, just being seated near somebody does not give you the right to force them to interact with you socially. That gives them a very justified cause to complain.
The problem is people, often, wont try to overcome these crushing problems. If you want to prosper you have to overcome this issue and not use it as an excuse for not talking to to people.
Absolute tosh. Many, many, people "prosper" in life without turning into uber-extroverted "outgoing" personalities. I'm a self-confessed introvert and consider myself pretty "prosperous" (and no, I'm not going to expand on that and tell you all the details of my life; you have no need or right to know and I don't feel the need to justify my existence to someone who comes across as, frankly, bigoted). There is an abundance of similar people in mathematical, scientific, engineering ("cerebral" people), etc. fields of employment and study. Both society and individually, we have all prospered from their (our) contributions.
The problem is many here are completely isolated either through choice or personality and seem happy to live like that. I think that is damaging.
What on earth gives you the right to brand other people who, by your own admission, are happy as "damaging"!?! Damaging to whom? "Damaging" to you because you feel that you're entitled to social intercourse with people who feel differently?
They're not hurting you or anybody else. They have every right to live their lives in whatever way they choose. This is an absolutely disgusting, intolerant attitude. As a society, we've made great strides in increasing tolerance and acceptance of people of different races, sexualities, genders, etc. but as you've clearly demonstrated, when it comes to people with different temperaments and personalities, many like you continue to have and proudly espouse attitudes that were best forgotten in the 1950s.
I like my own space from time to time but having personal interactions is crucial to development as a rounded person.
And there we have the crux of your argument. You believe everybody should be like you in this way and are intolerant of people who are different.
This sort of "jocks against nerds", "extroverts against introverts", "you can't be successful unless you're highly social" attitude is
hugely damaging to society. It's the same forces that cause children to be ashamed of their intelligence and underperform in education and life due to the (very real) threat of being bullied. It's the same anti-intellectualism that has, in part, lead to the rise of right-wing populism in many western countries. The same distrust of "experts" ("nerds" in adult form) and learned, intellectual, "cerebral" people in general that has lead to the current "an opinion is as good as a fact" position of mass-media and large segments of the public.
We should be accepting and celebrating people's differences, not trying to force them into some outdated social mold.