Paranoia

I noticed i'm very paranoid sometimes.. Like today i got so paranoid that i had a major panic attack, i blocked one of my good friends on Facebook and Messenger... Ect ect
The thing i got so paranoid was bc the friend that i blocked sent a screen shot of something i said, to my other best friend, it wasn't something bad at all, it was just a some thing, but i started to shake and i couldn't breathe bc i kept thinking that that friend sent screen shots of our conversations to someone else too, i hate the thought that someone knows something about me, anything, like that i'm cold, if i don't want them to know.
I made a huge thing out of nothing, and i scared my friends...
It's not the first time too, before i kept thinking that i'll buy the phone from 10 years ago so the government can't track me, that i'll erase Facebook and Messenger bc the fucking government reads my messages and "knows me"...
I'm scared that i have some mental illness to be honest, or that it will develop in illness in future bc i'm still young, i'm 15...
So if you have also some experience with this, please tell me, i'm kind of scared of myself... Really...
Thanks anyway.