That book (the Highly Sensitive Person by Elaine Aron) changed my life. It made me realize why I was different, and that being this way is normal! I re-read it every year or so, just to remind me. It has been a wonderful blessing to me.
I am wondering, how does your sensitivity manifest itself? Are you all just emotionally sensitive, or is your nervous system sensitive to all kinds of stimulus like loud noises, bright lights, etc.?
Has anyone taken Elaine Aron's self-test?
http://www.hsperson.com/pages/test.htm
I am not as emotionally sensitive as I used to be (meaning I don't get my feelings hurt as often I used to, but I used to be extremely sensitive in that way when I was a kid), but I am very sensitive to stimulus, such as loud noises, bad smells, general chaos, etc. I am also very empathetic and feel others' pain to the point where it's overwhelming. I am also socially awkward at times, getting nervous in crowds and not being being to articulate things very well in social situations. I also need a lot of sleep and a lot of alone time to recharge.