Don't worry, for worry is born largely of misdirected ambition.
When someone is singing, do not shrug your shoulders and assume a pained expression, so as to impress those who may be sitting near you that you are a great critic.
Have you ever thought what a desolate place this world would be without music?
Never neglect an opportunity to hear a great singer. If your means are limited, subdue your pride, for it is far better to sit in the gallery and be able to hear ten "artist concerts" than to sit in the orchestra and be able to hear only one.
Be willing to sacrifice much for your music.
Associate as much as possible with people who know more about music than you do. Read everything you can find on the subject. You will find some truth in all of it.
When you attend a concert look forward for the best only—don't be a pessimist, be an optimist, and you will derive much more benefit. Don't criticize audibly when someone is singing. An artist never does.
Before going to hear an artist sing, acquaint yourself as much as possible with the program.
While under one instructor, do not run around to other studios to have your voice tried. It is undignified, and reflects on your teacher, as well as upon yourself.
Become a sight reader by reading at sight.