Transiting Uranus square Uranus
The first time this influence occurs it signifies that you are no longer an adolescent and must take your position as an adult. It signifies rebellion against established standards, which is the reason so many young people go through a period of rejecting everything that they have been taught. It is necessary for you to experience your own individuality by asserting it against someone else's. There is nothing wrong in this, and the constant challenges of youth help keep society alive. It also helps you, because you need to be on your own and find your own ways of doing things, unhampered by the ways of the past, which may no longer be appropriate.
Even if you do not go through an especially rebellious phase, this will still be a time of intense and rapid change, when you go out into the world and pursue your own goals without the comfort and security of doing what your elders tell you. Doing what you are told may not always have been pleasant, but it did allow you to avoid responsibility, which you will have to take on now.