Hi. I know this is an older thread, but I didn't find my way to these boards until a couple of days ago. I was curious about the issue of sensitivity also. I was always accused of being "super sensitive" as I was growing up. Actually my 3 siblings also grew up to have anxiety problems. We're all artistic types, with higher IQs, and we're sensitive.
I read on another website that 15-20% of all humans (as well as "higher animals") are highly sensitive. We're more easily stimulated and stress out easier. In other cultures it's seen as a positive trait (because we're more creative and more sensitive to others), but in ours it's seen as weakness or shyness (especially in men) which can make us feel inferior.
They also said that highly sensitive people can be more prone to anxiety or depression if they had rough childhoods or bad life experiences (unstable childhood environment in my case). Most are introverts but some are extraverts. I like that they emphasize that this is just a trait we're born with and not a flaw or disorder.
The website is for a series of books titled [i]The Highly Sensitive Person[/i] by Elaine N. Aron, Ph.D. I haven't been able to get my hands on a copy, but I'm curious if anyone else here has.
I don't know the rules here for posting links, so I won't, but the website for the book has a short test you can take to see if you may be classified as highly sensitive.