There are two kinds of worries - those you can do something about and those you can't. Don't spend any time on the latter.
“If I had my way, I would have sex, drugs, and rock 'n' roll at least 4-6 hours a day. So long as there are going to be things in the way of that, we're going to have a revolution.”
“I constantly try to reinvent my sensibilities and my ideas. I enjoy some of the satisfaction that I get when I feel good about what I've done. But the process is quite lonely and quite painful.”