I think it's also because of expectations. Like those who you're around the most expect you to talk and behave a certain way, so it feels like you kinda have to fit yourself in that shell in order to be "you" around them. That's always half the battle for me. So I try to talk to strangers because then I'm like "okay, this is good I'm starting from a blank slate" but in that case, social anxiety becomes half the battle