That article was actually very interesting to me. I've always been the introverted sort, sure I'm friendly, but making friends doesn't come easily to me because I find small talk extremely uncomfortable and I always tend to feel awkward in big groups. It's always, ALWAYS nice to be reminded that there are other people out there like me.
Being 20 years old, and not drinking or smoking or doing drugs or wanting to party makes me a bit of an outcast as well. Yes, I'm aware these are good choices, that's why I'm making them...but it doesn't stop me from getting those "looks" from other people when they find out. Doesn't make it any easier to find people that I want to hang around with.
Overall I'm happy with my life, I do get lonely sometimes because at this point I have literally no friends outside of my family and current boyfriend, but most of my family are introverted like me too...
I figure, if I find people I'm happy and content being around (without feeling like I'm changing who I am to do it) then great...if not, I've got a great family and a wonderful boyfriend. Life's good.