Just a thought...
This is starting to sound a little paranoid. I can understand why, because the thought of the FBI, NSA, or anyone prodding into one's background is quite unnerving. Moreover, many of us have been taught that divulging any sort of classified information will result in the loss of one's fingernails, first-born, birthday, or similar. We are, however, in America. In large part due to the selflessness of those military folks who have gone before us, we do have freedom of speech. It's healthy for people to discuss concerns they might have, even though security clearances are notoriously considered "hush-hush" subjects. So, for those who are worried about background checks, consider these two things:
1) Everybody has skeletons in their closet (even people with Cosmic Nebulous Batman TS clearances or whatever). Some skeletons are more serious than others. While it may be an embarrasing thought that some investigator might find out about some stupid thing you (and everyone else) did as a teenager, keep in mind they've seen it all before. They'll not remember you from Adam once they're done with their job. If they don't ask, don't tell. If they do ask, don't lie.
2) Everybody whose been through the process of obtaining some high-level clearance knows that the process is mostly designed to scare you into revealing things about your character (kinda like how the DI's at OCS try to see what you are REALLY made of). I'd say that the process is about 20% concerned with your actual past, and about 80% concerned with your character. Again, keeping your mouth shut unless specifically asked is a good policy. Also, don't lie about anything they ask. Descretion is an important trait when entrusting a person with sensitive information and hardware. Use it when undergoing your background check.
Aside from that, don't be afraid to discuss your (very understandable)concerns. This is not by any means a threat to national security. We are all Americans, and we should be helping each other out. If all it takes is a good listen and a little reassurance, then let's do so and get on with the business of defending our country.
-A
Ummm...yeah