If you find yourself practicing and seeing very little improvement, then you will want to take special note of this method. Yes, this can be a very discouraging reality, but the good news is that you can start implementing a solution right now and learn how to practice better.
How long have you been learning music? Have you taken a lot of lessons, classes, or read a lot of books? If so, does this mean that your past experience will automatically make you an expert in music?