At what age do you find yourself? Why do people copy other people? Why can' they just be themselves?

There isn't a specific age that you find yourself it just happens..... And people copy other people because they feel insecure about the way they are and look and they see someone else who they think look and are better than them so the easy thing is to copy them..... And they can't be themselves because they think it's too hard and that people won't like them if they are just the way they are.... They just need to be more confident about themselves that's all