Unless there's a specific reason to self-identify as an Aspie, why do so? Much as one might like to think that the world is full of open-minded, intelligent, educated people, it's not. Label yourself as different, and you'll be treated differently (and not always in a manner you'd like) by an awful lot of people. Before you self-identify, you're "unique" or "eccentric" or maybe "peculiar". Once you do, you're "disabled" or "the nut case" or similar. Unfortunately, people do talk so it gets around.
If being Aspie is causing you to have extreme difficulties in school or at work that you simply cannot work around, you may have to provide the information on the chance you can improve your position/problems. You do have to go through the motions of claiming your disability and asking for accommodation to be protected under the law (US law, anyway). If you don't, and you're not functioning well, you have no recourse if they fire you/demote you/toss you out of school.
Remember that the accommodations you might be able to get up through high school are not necessarily going to follow you once you pass into the workforce or college. They don't - what the public school system has to do for you up through grade 12 ends at grade 12. Things change very dramatically afterward, so it's best to plan ahead.
Of course, if you're already working, once you do get outed as an Aspie on the job you're at risk of being labeled as "that person with the weird disability" - with a good chance of having any hope for a decent career progression shot out from under you unless you become extremely proactive and pushy about it. You'll have to be 200% better at what you do than the person next to you who is not a known Aspie just to get the same outcome. Life tends to work that way.
If you can pretty much pass as NT, I'd suggest keeping your personal information private and not sharing it with anyone you don't know very well. What would you really gain from broadcasting, anyway? Who really needs to know?
So no, to answer your question. I do not tell people I'm an Aspie.