You really, really, really have to love what you are going to do in theatre because it is an unmerciful life. It's six days a week. It's eight performances a week. And that's doing the exact same thing over and over and over again.
The next time you feel you have to say, "I love you" to someone, say it to yourself - and see if you believe it.
I got a lovely check today from being a writer that I earned by sitting at home. That's rewarding.