Dealing with paranoid personality disorder (distrust of people)?

well I haven't been to a therapist so I haven't been officially diagnosed, however, I've done many self diagnoses quizzes and it said that I had paranoid personality disorder, and my type of enneagram says that I am probably paranoid. plus i trust that I fit pretty much any category it means to have this disorder. I'm only 13 years old, and I'm in the 8th grade. It's really hard to go to school. when you think that whenever a person laughs, they're laughing at you. when I feel this way, I often blame myself. if I feel reclusive or dejected, I say it's my fault. that I'm messed up. and I choose to bash on myself. The smallest events make me think that someones out to get me. say that if I say hi to you and you don't say hi back until i say hi a second time (this is rare). I auto think that you hate me. or if you're popular, you hate me. it's hard. I really just want a group of friends that I know I can trust and be around, I'm tired of feeling this way! it's not as simple as to say, you're doing this to yourself, stop doing it. I just, wish, that there was someone out there for me. can I have some advice?