What you're describing does sound like delusional beliefs to me. Here's a sort of thumbnail sketch for you:

a delusion that an administrator on another site is pushing you to kill yourself is a delusion that is a problem, that puts you in danger, and that medication is more than appropriate for.

A delusion, on the other hand, that -- oh, I don't know... A delusion that you're more beautiful than Elle Macpherson, on the other hand, is probably not a problem at all.

Make sense? They may both be delusions, but one is harmless, the other is not. And harmful delusions need some sort of treatment.

What bothers me, though, about this is that your doctor hasn't taken the time to discuss this with you enough that you can understand why he's prescribing this medication. That's worth going back and talking to him about.