Then you’ll be excluded from a lot of groups and social activities without even knowing. That might be an acceptable trade off for you but it's a trade off nonetheless.

I'm not in high school to be afraid of being "excluded" from some social activities.

And that’s fine, just pointing out that if you were part of a sports club, parents group, whatever, you’re relying on someone keeping you in the loop and making your life harder if you want to be part of it. I don’t judge, I just don’t see why you think it’s immature to want to have a social life.

There are parts of the world that run on WhatsApp. In Brazil it is impossible to live a normal life without it, as absolutely everything from shopping to parking to healthcare is managed through WhatsApp specifically.