Listen to what others tell you about your voice. If you're only singing to please yourself, you might as well just sing under the shower. But if you're singing for others, you are reliant on them to ask you to sing.
For me, the most enjoyable type of singing is opera. It allows you to move, to wear a costume... to do something with your body. When singing in concert, you have to stand up in front of the audience, next to the conductor, which is less natural.
Success is related to faith. Faith comes first.
Every audience has its character; I like America - they love me. I suffer from stage fright, but in America not so much.