Learning an instrument on your own just isn’t going to work. If you want to progress quickly, we all know that you need a teacher. Why is a teacher so important? One major reason is just because they are an educated third party listening to your playing.
You practice constantly preparing diligently for an upcoming performance, but it’s just not enough. You need someone to listen and critique so you can make appropriate changes. Lessons are usually held once a week, and it’s great that you can get your teacher’s feedback that often, but it’s not enough. You need this feedback daily. One way to get this specific feedback is to record yourself.