how to stop being intimidated by *everyone*?

idk if this is the right sub to post this on but how do i get out of the mindset that « everyone is cooler than me so theres no point in trying to talk to them, they wont like me » ? i know the obvious answer is to be confident in urself and just talk to them but it’s not that easy. i have confidence with the friends i already have, but around new people i get so paranoid that they’re judging me and i cant help but automatically assume every single person that isnt my friend is making fun of me in their heads. i also NEVER know what to say to anyone new