I am increasingly alienated from my childhood. I always feel that we don't know who has changed. What should we do?

In fact, everyone will change, just like an obedient child who suddenly misbehaves at the age of 14 or 15. Actually, it's nobody's fault that I read what you wrote. For a good sister, it must be from the heart, but the disdain of the other party will make you feel that you have done something wrong and feel sad. Perhaps it is cruel to say that everything has an end. She is not the old one, and neither are you. You just can't see the change of personality by yourself. Since she is going to fly, let her go, because even if you keep being nice to her all day, she just wants to fly, but she can't hear what you say, which is self-defeating. Let nature take its course, people who think too much are changing. I believe that when she is tired of flying, she will remember that she once had a good sister who cared so much about herself.