Do you ever get nervous having to give a talk in public or meeting a new person? The nervousness in the pit of your stomach is anxiety. Now if you're afraid of giving a talk because you think people will boo you or you're afraid of meeting a new person because they'll hate you that's closer to paranoia but still anxiety because "normal" people have those thoughts cross their mind as well. Now for it to be paranoia you kind of have to think something that's really unlikely and believe not just that it could happen but it absolutely will happen. For example---I'm afraid of meeting a new person because they are actually a member of secret organization sent to spy on me. Paranoia has to have at least a hint of delusion in it where anxiety that stuff could actually happen---its not likely but people could boo you or hate you but the chance that someone you just met is actually an agent sent to spy on you is pretty much zero unless you have some important job like president/prime minister or belong to a terrorist cell. A lot of people with psychosis have anxiety as well.

Paranoia to me means a judgement has been made (by oneself or another) that the belief is unjustified. So one can't acknowledge a paranoid delusion at the time because if one acknowledges it's unjustified, then it no longer remains a delusion...am I making sense? If someone says they feel paranoid, by definition they are acknowledging that their anxiety is irrational.