Yes, I've been told I'm paranoid. My wife tells me that most of all. My friends call it my "healthy paranoia".
I don't think it is literal paranoia. I am just not very trusting. It is probably part of the syndrome--I do not synchronize to other people's emotions, and I do not project my own feelings on others. Every time someone does something I don't expect (say, makes a left-hand turn from the right hand lane, or blows up at me because I did them a favor), then I am that much more suspicious that anyone else MIGHT do the same thing.
I think frequently I'm right. One of my biggest suspicions involves public bureaucrats and low-ranking hirelings who are paid to obey. Say we have some business to take care of...my wife will trust them to do their job and I won't. OK, so the package doesn't arrive, the check isn't deposited, the call never shows up, the reservation was never made, the application was never submitted, whatever, and then I say "SEE, I TOLD YOU SO", and she says "OH RELAX, WE'LL JUST CALL AND TELL THEM ....". Well, since I don't have a history of good rapport with strangers, it's never JUST a phone call.
>>When I tell them I'm aware of what they're doing, they all say, "Oh, you're paranoid!"
Never confront them that directly. For one thing, if you admit that you think they're using you without reciprocating friendship, then they'll look down on you. In your sweetest voice, tell them you don't think you'll have time to help with their homework, and then tell them you've been feeling bad about not spending enough time with your friends.