Mother to four teenagers

When the children were the little, I almost couldn't wait for them to grow up and we could have adult conversations and all would be swell. Little did I know that when they reach teenage hood, they almost revert back to being toddlers.  Don't get me wrong when I have conversations with them, they can are interesting, articulate, sometimes opinionated, but now they don't really want to talk. When they were little they would tell me every little incident, now it's like pulling teeth to get anything out of them. They are shockingly private about everything, and if you as much as glance at their phones, all havoc breaks loose. At school they have to give their phones in to the office, but I know they don't, apparently they are worried that the school will read their texts, oh yes because office staff really have the time and inclination to do that don't they? As for being friends on social media, you just be joking, they blocked me years ago and when I started to read my 17 year old daughters tweetes on twitter, she reported me to twitter! My sweet little fourteen year old, well she was when she was ten has now turned into Kevin the teenager, everything is embarrassing to her, when I went o parents evening, she said I talked too loud and my shoes didn't go with my clothes. Then there is my nineteen year old, he is right about everything, the world, the universe, religion, once a believer, now a confirmed athiest. Don't they just break your heart? My twelve year old turns thirteen this year and the signs are starting to show. Do they do gap years for parents?