Extremely paranoid...?

Okay idk what's wrong w/ me. My friends all tell my I have paranoid personality disorder but I don't believe that. But I've been thinking more about it. What do you think? I'm able to act normal and hide that I'm paranoid and only my close friends really know how paranoid I am. Pretty much whenever I make a new friend I never tell them any secrets and when I do tell people I have to 100% trust them. And I always think people are out to get me. And I'm 99% sure that people in my school are trying to ruin my reputation ik it seems crazy but I've been told how much the gossip about me and they've made up rumors about me. My curtains are almost always shut bc I feel like people are watching me through them and at night I constantly check all corners of my room bc I feel like there's a man in the corner watching me. At night when everyone's sleeping when i go to the bathroom I leave in a defense position (idk what to call it) incase someones standing there. and when I leave my room at night I have to have the light on so I can see everything. And when I'm home alone I constantly check to make sure the doors lock and all my downstairs lights have to be on. I get that I'm paranoid but I've looked up symptoms of ppd and it seems like it's more mistrust for people that's obvious and they're really odd. I make an effort to make sure It isn't obvious. I'm 14 currently and before you say it's schizophrenia I don't show any symptoms besides the delusions that I talked about here.