The internet isn't what it used to be that is for sure, remember when 4chan was the quintessential crap hole? Now it's like every site that is popular.
Being introverted and having troubles with anxiety, lack of empathy and overall awkwardness (especially) in social situations has less to do with having introverted functions, and more with underdeveloped extroverted functions (though I'm going slightly off-terms here).
While your main driving forces are naturally more developed and are the main definition point of your being, your secondary functions will lag behind when not actively dealt with, resulting in situations where the primary functions are unable carry the weight.
Which means any problems you have can be alleviated. In a perfect situation, an introvert and extrovert should be indistinguishable, because while they reach their goals through different functions, they are both able to respond the same way.
What I'm saying is that often people hide their inabilities behind being intro- or extroverted, instead of trying to improve in lesser developed areas.
And I'm saying that not to point fingers, but to encourage people to pick up the slack. Introversion might be an obstacle in some areas, but not the definite end.
I'd say that's a pretty black and white way of looking at things and while your definition of introversion is correct I think some of your views towards the end there are a little unfounded. Some people just have certain limitations and it's less about changing yourself to make things easier, but finding better ways to deal with it. I can honestly say I've tried for years to take hold of my more extroverted characteristics but it's hard. The human mind is an amazing, but complex thing and it often take years of therapy just to change the smallest thing about someone's mind. It's not as easy as just telling yourself you're going to be an extrovert today.