"It is not a matter of being better than anyone else. How can you love trying to be better than anyone else? Play for your own satisfaction, and for other's enjoyment."
—Bud Herseth (Former Principal Trumpet - Chicago Symphony Orchestra)
Mr. Herseth was an incredible player and teacher and his above words are incredibly wise.
There is a byproduct of playing for your own satisfaction: You tend to enjoy the process of getting better a whole lot more and therefor do the work. Bottom line: You get better.
Practice something until you love it and then share it with the world. At that point you'll be dying to share it with us and that will shine through in your performance.