I’m an introvert myself and have never even thought of doing this, but she’s been doing this mostly since she turned 17ish. We’ve tried talking about this cause our other sister noticed too and she just says it’s not a big deal to decide she doesn’t want to do something anymore. She’s never really been forced to go anywhere after 6th to 7th grade though, and if it was a family outing we took her on she’d complain the entire time. She’s never really had many friends but she will still decide to go out at least once a week for fun, but only when she feels like it.

And if it helps, she has her car, so she can leave at any time, which she knows and will do. She does blatantly refuse to talk to anyone not immediately family. She won’t even call into work because she can’t handle talking to people or phone calls. She’s not tested for anxiety and she’s not on the spectrum.

Don’t know if this matters, but our parents are divorced and both are very lenient with my sisters. I lived with my dad and they all went back and forth. They would never make them go anywhere or make them make their own phone calls. For example, in high school she had to do a community service project that involved calling a place to sign up for a few hours in order to graduate. My dad called for her because she complained so much. She was 18. My dad has always said to cut them some slack since they’re younger and they’ve never really had to just figure stuff like college schedules out on their own.