I always tell that to young people - go to college, do theater, work with an audience. Don't try to learn how to act in front of millions and millions of people. Don't make that your first ambition, to be on a sitcom or get into the movies. Learn who you are as an actor, and the best way to do that is to do it in front of an audience.
I got a wonderful college education. I went to Harvard. In those four years I accumulated a lot of knowledge but I also created a kind of habit of learning that has stayed with me my whole life.