...and I don't mind telling people.
Based on my own experience I've found it very well can be a great idea to tell others who I function.
I know some people think I'm weird. I am, so they are right.
I volunteer at a local amateur theatre where I'm having a great time as a technician (it's my 9th season now) - and I'm quite good at it, but when it's getting too loud in the dressing- or makeup room and I need to go somewhere else, I think it's nice for people to know why I do so and it's basically not their fault and that I'm not mad at them.
If I have to stay, they understand me when I ask them to lower their voice (right now it's about 30 actors from age 10 and up... they are LOUD!).
People have also begin to understand why I don't hang out friday evenings and drink a beer.
Not that I tell everyone I have AS, but it usually tell it to people I work close with or when someone ask.
Since it's a theatre, I guess everyone knows anyway as gossip is what keeps most people alive
I also have a shedload of different tshirts with different statements.
Not all saying I'm an Aspie, but they usually come with a hint like;
http://www.thinkgeek.com/product/a69c/?srp=1
or
http://www.thinkgeek.com/product/ed34/?srp=1
or another third one saying "Aspie!" on the back and
"An aspie is one who has Asperger's Syndrome, which is believed to be part of the autism spectrum.
Aspies, while being quite gifted verbally, have social, emotional, and sensory integration difficulties, among others.
Aspie is an affectionate term, and is not meant as a put down.
I'm an aspie.
I'm not so great at making idle chit chat at parties, or even at being in crowds, but I can get you home from anywhere.
I just consult the map in my brain." on the front.
That's just my approach to being an Aspie