Totally normal, @Whitesky75.
There is a book called Divas and Doorslammers, where the author, Charlie Taylor, says that, basically, during adolescence, the teenage brain is retiring - structural changes - and during these changes, they lose certain abilities, such as empathy, mood control, temper control, sense of perspective. He describes this as a form of temporary brain damage, which sounds scary, but the important word is temporary. Once the rewiring is complete, and things settle down again, they get back all, or most of these abilities.
Ds3 went through this the worst of my three, and he honestly did come out the other side as a well adjusted, decent, empathetic person.